Unusual "Popup" Checkout in Cart page on iOS mobile, instead of directing to Shopify's true checkout

Store Design
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Topic summary

A Shopify store owner reports an unusual popup checkout appearing on iOS mobile devices, primarily affecting users in the US and UK who arrive via Facebook ads.

Key Issues:

  • The popup bypasses Shopify’s standard checkout process
  • Removes important features like discount code input and accelerated checkout options
  • Doesn’t occur 100% of the time but has high likelihood with iOS users
  • Raises concerns about customer trust and conversion optimization

Technical Context:

  • Developer suggests the issue likely stems from custom code or a third-party extension rather than the theme itself
  • An image attachment is included showing the problematic popup

Current Status:
The store owner is seeking diagnostic tips, insights, or suggestions to resolve this issue and restore the standard Shopify checkout experience. The discussion remains open with no solution provided yet.

Summarized with AI on November 10. AI used: claude-sonnet-4-5-20250929.
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Hello Shopify Community,

I am seeking some assistance with a perplexing issue we’ve encountered on our Shopify store: leyadoll.com

We’ve noticed an unusual popup with the “Checkout” feature built-in that appears when users try to checkout on iOS mobile devices(It doesn’t occur 100% of the time, but there is a high likelihood that this issue appears with iOS mobile users in the US/UK.). To us, this popup seems to “bypass” Shopify’s standard checkout process, which is concerning as it might affect customer trust and remove high-converting features like order summary(input discount code), and Shopify’s accelerated checkouts. However, customers can still finish placing the order with this popup-style checkout.

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From what we understand, this does not seem to be a feature of the theme we are using, as it was suggested by the developer that this is likely caused by some custom code or a third-party extension. The issue has been specifically observed on iOS devices and occurs consistently for users in the US and UK, mostly new users coming from our Facebook ads.

Any insights, suggestions, or diagnostic tips you could offer would be greatly appreciated. We’re really keen on resolving this to ensure a smooth and trustworthy checkout experience for our customers.

Thank you in advance for your help!

Best regards,

Leyadoll Team