Yes, Shopify theme customizations can absolutely affect how product pages render for users, especially those coming from Facebook retargeting ads.
Here’s what’s likely happening and how to fix it:
Theme-Based Conditional Rendering
Some Shopify themes or customizations use JavaScript to conditionally display price or buttons based on visitor type, geolocation, or referrer.
Users coming from Facebook may have UTM parameters or cookies that interfere with how the theme loads elements.
Deferred Content Loading
App Conflicts or Script Errors
Ad Blockers or Browser Behavior
Some browsers, particularly on iOS or with Facebook in-app browsers, block JavaScript or cookies, which may prevent the full product page from rendering properly.
How to Fix It
Test with UTM parameters: Manually load a product page with Facebook UTM codes to replicate the issue.
Check browser console for JavaScript errors.
Review theme.liquid and product.liquid for any conditional logic affecting button or price display.
Disable third-party popups or discount scripts temporarily and test again.
If needed, isolate the theme issue using a fresh, uncustomized theme copy for testing.