Shopify problems and how to fix them

Fixes for Shopify stores losing sales to broken buttons, apps and mobile checkout bugs.

Shopify add to cart button not working: causes and fixes
Add to cart does nothing, stays greyed out, or only works after a refresh? The four causes on Shopify and how to find which one your store has.
Shopify cart drawer not opening after add to cart
The item is added but the slide-out cart never appears, or the screen dims with no drawer. Find the setting, app or script conflict behind it.
Shopify price not updating when selecting a variant
Picking a size or colour leaves the price, photo and URL unchanged, and the default variant lands in the cart. How to trace the broken variant script.
Shopify mobile site moves left and right: how to stop it
Your Shopify store wobbles sideways on phones or shows white space on the right. Find the element wider than the screen and fix it at the source.
Shopify product images not loading or showing blank
Product photos show as blank boxes, appear only after scrolling or refreshing, or fail in Safari or Firefox. The causes on Shopify and how to test each.
Shopify cookie banner too big on mobile or covering the screen
Consent banner covering half the phone screen or sitting on top of Add to cart? How to shrink it, stop banners stacking and keep buttons reachable.