Add to Cart Button does not work correctly the first time

Technical Q&A
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Topic summary

Main issue: The Add to Cart button fails on the first click (especially in Incognito). The cart count increments to 1 but the cart drawer/pop-up doesn’t open; a second click opens it showing 2 items. Refresh then shows 1 item. A screenshot error indicates the cart state isn’t updated before the UI code runs.

Investigation steps: The poster had modified some CSS but not the add-to-cart logic. Tested across devices and even switched to a fresh theme; the issue persisted. No obvious cart-related apps were in use, only cookie/order helpers. Site link was provided.

Community input: One reply suggested a theme auto-update issue and offered to help externally.

Resolution: Root cause was a residual integration from the previously uninstalled “Selleasy” app. Reinstalling Selleasy, then manually toggling it on and off resolved the issue. Likely the app’s theme integration wasn’t disabled in the Theme Editor before uninstalling, disrupting the cart workflow.

Status: Resolved. Actionable takeaway: Properly disable app embeds/theme integrations before uninstalling apps.

Summarized with AI on December 17. AI used: gpt-5.
1

My problem is that my Add to Cart button does not work correcty, when I use Incognito Browser and press add to cart the first time, nothing happens except the currently in shopping cart number changes to one.
When I press the button a second time, the pop-up for the shopping cart opens and it shows two in cart, when I refresh the shopping cart instead of pressing “add to cart” again it also shows one product in shopping cart.
I know why the shopping cart does not show, because of the error

eatf_0-1727957802200.png
eatf_0-1727957802200.png888×166 7.35 KB

So I know that obviously the cart does not update before the code is executed.
I changed a bit of code so I thought it might be my user code, even though I have not changed anything regarding the add to cart button, except some css.

I even went as far as just using a whole other theme completely from scratch to check if its my user code, but it still did not work.
I tried it on multiple devices and it never works the first time.
I am at a loss on what could trigger the error. I don’t use any apps that change the product pages or logic, just some cookie and order helper apps.
Can anyone help?
My website is: https://growrepublik.de/

2

This is probably an issue of theme code where it does not update automatically or instantly.

Please reach out via mail. I believe I can definitely take a look and come up with a solution for it.

3

I went over all my uninstalled apps, turns out I had “Selleasy in there”, I reinstalled it, turned it on and off manually and it worked, so probably the fact that I didnt turn off the app in the Theme Editor before I uninstalled it somehow fucked up the workflow.