Plugin doesn’t work on my testing web site

Hello!
I like too much your plugin…. but it doesn’t work on my testing web site…

A user can’t choice how many coffee to offer and the button is not clickable..
https://www.spqrun.info/test/#costi

It works only with the popup: https://www.spqrun.info/test/#coffee
also if the designe is not good

Can you help me please?
Thank you in advance,
Dario

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