Shopping Cart increases only the item that was firstly added

Hi partners,
I am a beginner in bubble apps and this is my first project.

When I click on the button “Add” it changes only the quantity of the item that was firstly added to the cart.

I already remake it a couple of times but I could not fix that.

I hope you can help me.
I welcome contributions for any other aspect of this project.

You can see that here:

Best wishes!

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