Card drawer don't show and product variants can't be added to card

Topic summary

A user is experiencing issues with product variant selection and cart functionality on their Shopify store using the Florence theme from Lumintheme.

Core Problems:

  • Product images don’t update when selecting different variants
  • Only the initially displayed variant can be added to cart
  • Cart drawer fails to appear
  • Once a variant is changed, even returning to the first variant prevents purchase

Browser/Device Behavior:

  • Chrome: Occasionally works after ~10 refreshes and extended wait time
  • Firefox: Functions normally after ~10 second delay
  • Internet Explorer: Completely non-functional
  • Android mobile devices: Not working

Troubleshooting Attempted:

  • Cleared cache and cookies
  • Tested with mobile data and VPN
  • Contacted both Shopify and Lumintheme support (neither could identify issues)

Current Status:
Another user suggested checking the theme.ProductForm code and inspecting for JavaScript errors, but the original poster cannot locate this code element and lacks technical expertise to implement the suggested fixes. The issue remains unresolved, with concerns about potential customer impact.

Summarized with AI on October 29. AI used: claude-sonnet-4-5-20250929.

Hello, I hope someone can help me here. I contacted the Shopifysupport and Lumintheme-Support but both cannot find any issues and the main problem is, that they cannot see any problems either… When I try to buy another product variant, then the picture won’t change an I cannot add it to the card. Just the first product which is automatically shown, I can add to card. If you change the variant and go back to the first, then you cannot buy it anymore. The card drawer won’t show too by this problem. I tried to delete cache and cookies, i tried with mobile datas and other VPN, but problem still remains. Sometimes it works when I stay longer on the side per Googlechrome and refresh it the 10th time. Then the side will show normal. In firefox it just shows it normal after waiting like 10 seconds. Internet Explorer won’t work at all… and on any mobile device of mine (android) it won’t work either. I am really in need for help. I don’t know now if some customers cannot buy the products too? Does someone had this issue too before? I need urgent help. Thank you so much!!!

Hi,

Hope this will help

  • Check Product Variant Code

Code example


search for this:

theme.ProductForm
  • Check Cart Drawer Function
  • Inspect for JavaScript Errors

Hello, thanks for trying helping me, i could not find theme.productform by the codes, could it has another name? I am using the florence theme from lumintheme.

okay i dont know what you mean, i am not a tech pro as you, but how can i fix it?