9 Common Shopify Technical Issues We Fix (and How to Resolve Them)

Your Shopify online store is running. You have products, visitors, and perhaps even regular orders.

And then one day, something breaks.

A customer writes to you that they can't pay. You test it yourself and the "Add to Cart" button no longer responds. Or you realize that a product has mysteriously disappeared from your catalog for several days, without you having touched anything.

The problem with Shopify bugs is rarely their complexity. It's their timing. They happen when you launch a campaign, when you have traffic, when you can't afford to lose sales.

And while we're trying to figure out where it's coming from, we waste time, touch things we shouldn't, and sometimes unintentionally make the problem worse.

The good news is that the majority of Shopify technical problems have a specific cause. You don't need to be a developer to identify them. You just need to know what to check, and in what order.

Here, I share the 9 most common bugs we encounter at Magify on our clients' stores, with the first checks to make for each to quickly resolve the situation.

Common technical issues

1. The Shopify theme displays incorrectly

A section that disappears. A layout that goes haywire on mobile. A design that no longer looks like what you configured.

This type of problem often occurs after a modification in the theme editor, or after the installation of a new application. Some apps inject code directly into the theme, and this can create display conflicts without you having touched anything yourself.

What to check first:

• The modification history in the theme editor (Shopify keeps automatic backups)

• The behavior on mobile AND desktop

• The rendering with the Dawn theme activated (the default Shopify theme)

If the problem disappears with Dawn, the cause is your current theme or an app. Deactivate them one by one to identify which one.

2. Products do not appear on the store

You have created the product, filled out the description, added photos. And yet, it is nowhere to be found on the site.

This is a classic problem, and it almost always has the same origin.

Check these three points in order:

• The product is in "Active" status (not "Draft")

• It is associated with at least one collection

• This collection is indeed added to the navigation menu

A product can perfectly exist in your back-office without ever being accessible from the site. If the collection is not linked to the menu, your customers cannot find it, even by searching.

3. Shipping fees are not working correctly

Free shipping is not triggered. An incorrect rate is displayed at checkout. Or worse: no shipping option appears and the customer cannot complete their order.

Shopify shipping configuration is one of the most technical sections of the platform. It distinguishes between shipping zones (the countries and regions you ship to), shipping profiles (rules by product or product group) and the conditions associated with each rate.

A single misconfigured parameter is enough to block the entire process.

Start by checking that the destination country is included in an active zone, then that the shipping profile is correctly associated with your products.

4. Payment is not working

This is the most critical issue. If a customer cannot pay, you lose the sale. No discussion.

The most frequent causes:

• Shopify Payments not activated or incomplete account verification (bank details, merchant identity)

• External payment provider misconfigured

• Payment journey never tested before launch

This last point is more common than you might think. Shopify offers a test mode with fictitious cards. Validating the entire journey before launching a campaign should be a systematic reflex.

Go to Settings > Payments and check that your main payment method is active.

5. Shopify automatic emails are not being sent

Order confirmation, shipping notice, abandoned cart recovery. These emails are critical for customer relations. When they don't arrive, customers get worried, contact you, and you waste time managing situations that shouldn't have happened.

What to check:

• The sending email address in Settings > General (an unverified address can block sending)

• Notifications in Settings > Notifications (some may have been manually deactivated)

• Custom email templates (a syntax error in the Liquid code can prevent sending)

Also remember to check your spam during tests. It's silly, but it happens.

6. A Shopify app is causing bugs

Shopify apps are useful. But every installed app adds code to your store. After about ten active apps, conflicts become frequent: slowdowns, JavaScript errors, elements displaying incorrectly or disappearing.

The method for finding the responsible app is simple, but a little tedious: deactivate them one by one and test your store after each deactivation. This is the only truly reliable way to identify it.

A good habit to adopt: only keep the apps that have a measurable impact on your business. The most stable stores rarely have more than 5 to 8 active apps.

7. The Shopify store is slow

A website that takes more than 3 seconds to load loses on average half of its visitors before they even see anything. And Google remembers this too, as speed is one of its ranking criteria.

The main causes of slowness on Shopify:

• Images that are too heavy (aim for a maximum of 100 to 200 KB, in WebP format)

• Too many active apps loading additional scripts

• An unoptimized theme that generates unnecessary code

Use PageSpeed Insights to measure your current score and precisely identify what is slowing down your store. It's free and takes two minutes.

8. Product variants not working

The selected color does not update the photo. A size displays "unavailable" even though it is in stock. The price does not change according to the selected variant.

These bugs almost always come from the variant configuration in the product sheet. Make sure that each variant combination has a defined stock, a price entered, and that the media are associated with the correct variants in the dedicated tab.

9. The "Add to Cart" button is unresponsive

The customer clicks. Nothing happens. No animation, no notification, no item added. This is one of the most frustrating bugs, and one of the most impactful on conversion rates.

This problem is almost always caused by a JavaScript conflict: an app or a modification to the theme code has introduced an error that prevents the event from triggering.

To identify the source:

• Open your browser console (F12 > Console) and check for red errors

• Test with the Dawn theme. If it works, the bug comes from your current theme

• Deactivate your apps one by one until you find the source of the problem

How to avoid these problems in the future

Most of these blockages have the same origin: a store that gradually grows, apps added over time, theme modifications without documentation, and too infrequent testing.

A few simple habits to limit the risks:

• Regularly test the complete purchase journey, as if you were a customer, from a mobile device and from a different browser

• Document every modification made to the theme

• Check the checkout before each marketing campaign

• Limit active apps to those that have a real and measurable impact

These are not constraints. This is simply what allows for a stable store in the long term.

When to call on a Shopify expert?

Some problems can be solved in a few minutes when you know what to look for. Others are deeper: a conflict between several apps that neutralize each other, a theme modification that altered the native code, a checkout bug specific to certain configurations.

If you have followed the steps above without result, or if the same problem recurs regularly, calling on an expert will save you considerable time. And will prevent you from breaking something by trying at all costs to fix it yourself.

Need a quick fix?

If you cannot find the cause or if the bug is impacting your sales, our team will intervene within 24 hours at a transparent rate.

Conclusion

The goal always remains the same: a well-functioning, selling store where you don't have to spend your time putting out fires.