Quantity updater in cart page not working - Debutify

Sate
Tourist
10 0 3

Hello i have a problem in the cart page of my store. When there is something added to the cart, it's not possible to update the quantity, clicking the [+] or [-] don't make any change. Can anyone help me with this bug? 

store: HERE

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Sate
Tourist
10 0 3

up, please need help

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