Select button (inside templates selector) doesn't work (reloads the page)

Hi,

I've set up New Blog Templates and integrated it with Gravity Forms (as explained here: https://premium.wpmudev.org/project/new-blog-template/#usage ).

Everything looks nice but when I click on the select button (inside the templates selector) the whole page reloads (instead of actually selecting the template).
(NB: the demo button works as expected)

Any idea?
I can provide an access if necessary.

Best Regards