Add to Cart Button with Product Count

Hello community!

I just want your help with this prototype using variables.

• The prototype is, that I can select multiple tiles/boxes, and the number of items in the “Add to Cart” button will increase by 1.
• The button will only appear when I click/add items.
  (These all work perfectly fine)

However, the problem occurs here:

• When I unclick an item, the button disappears, which should not happen. It should only disappear when ProductCount reaches 0.
• The button should stay and only subtract the value until it reaches 0 then disappears.

And this is where I’m having a problem:

I don’t know what I’m doing wrong. I’m still learning variables and prototypes. Would love to learn more about this. Thank you!