Why Your Shopify Theme Broke After an Update

Shopify theme updates are supposed to make things better. More often than not, they do. But occasionally a theme update breaks something that was working fine before, and suddenly a store that looked presentable has layout problems, missing sections, or styling that has gone wrong in ways that are difficult to explain.

If your Shopify theme has broken after an update, this post explains why it happens and what is usually worth checking first.

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Why theme updates break things in Shopify

The core reason is almost always the same: the updated version of the theme has changed how certain sections, settings, or code blocks work, and those changes conflict with customisations that were made to your store.

When you customise a Shopify theme — changing colours, adding sections, adjusting settings, or editing code — those changes sit on top of the base theme. When the theme updates, the base changes underneath your customisations. If the update changes something your customisation relied on, that customisation can break.

This is especially common when:

• custom code has been added directly to theme files
• sections or blocks have been heavily modified
• the theme has been updated after a long gap and multiple versions have changed
• third-party apps have injected code into theme files
• the update includes structural changes to how sections or settings are organised

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What tends to break most often

The most commonly affected areas after a Shopify theme update include:

• homepage sections that no longer display correctly or have lost their settings
• navigation menus that have changed structure or lost their styling
• product page layouts that look different to how they were before
• custom fonts or colours that have reverted to defaults
• app blocks that no longer appear or have moved position
• mobile layouts that have shifted or broken
• custom code snippets that no longer work with the new theme structure

In some cases the changes are subtle. In others the store looks significantly different to how it did before the update.

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The difference between updating and overwriting your theme

Shopify handles theme updates by creating a new copy of the updated theme in your theme library. It does not automatically apply the update to your live theme. You have to do that manually by either using the built-in update process for Online Store 2.0 themes, or by installing the new version and re-applying your customisations.

For older themes that predate Online Store 2.0, updating is more disruptive. Any changes made directly to theme code have to be carefully re-applied to the new version by hand, which is where problems most commonly arise.

For newer Online Store 2.0 themes, section and block settings are stored separately from the theme code, which means updates are generally less destructive. But custom code additions can still cause conflicts.

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What to check first if your theme has broken

Start with a systematic check rather than making random edits under pressure. The most useful first steps are:

• Check your theme versions — in your Shopify admin under Online Store > Themes, you should be able to see your current live theme and any previous versions. If a backup exists, compare what has changed.
• Check the theme editor — open the theme customiser and go through each section on the pages that look wrong. Some sections may have lost their content or settings and just need reconfiguring.
• Check for app conflicts — if any apps add sections or scripts to your theme, check whether they are still working correctly with the new theme version.
• Check mobile separately — a layout that looks fine on desktop can still be broken on mobile after an update. Always view the store on a phone as well.
• Check custom code sections — if custom HTML, CSS or JavaScript was added to the theme, check whether any of it is now conflicting with changes in the updated version.

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Can you roll back to the previous version?

In many cases, yes. Shopify keeps previous theme versions in your theme library for a period of time. If you updated recently and the previous version is still there, you can switch back to it as your live theme while you work out what went wrong.

This is not always a perfect solution — if there was a reason you were updating (a security fix, for example, or a feature you needed) — but it gives you time to sort the problems properly rather than leaving the store broken while you work.

The practical lesson is to always keep a backup of your theme before applying updates, and to test any update on a duplicate theme first before making it live. These are the kinds of steps that a proper website update checklist should include, whether you are working with Shopify or WordPress.

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How to avoid this happening again

A few practical habits make theme updates much less risky:

• always duplicate your live theme before applying any update
• test the updated version on the duplicate before switching it live
• document any custom code changes so they can be re-applied after updates
• avoid making code changes directly to theme files where possible — use custom CSS and app blocks instead
• review what apps are installed and whether any of them are injecting code into your theme unnecessarily

Handled properly, theme updates do not have to be disruptive. The problems usually come from skipping preparation steps or from a store that has accumulated too many layers of customisation over time.

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If your Shopify theme has broken after an update and you need help getting it back to how it should look, take a look at my Shopify fixes service, check my website pricing, or get in touch directly.