Pop-up not working with Pro Theme

Hello there,

I’ve bought your plugin, I’m very excited to use it, however at the moment, the pop-up doesn’t seem to be working, I think it may be because I’m using Pro Theme from Theme Co (https://theme.co/pro/) I wonder if that’s overwriting something in the WooCommerce add to cart button, but I’m not sure what. Any help would be very much appreciated. My site is: photoonacake.co.uk

Thanks in advance.

Ant