Datepicker in Contact Form 7 not working in PopUp Pro

Good Evening

I have a similar issue with PopUp pro as mentioned in the following post
https://premium.wpmudev.org/forums/topic/datepicker-in-gravity-forms-not-working-in-popup-pro

Only in my case it's an issue with Contact Form 7, as in the other post, the issue can be recreated by going to http://waterfront.rudland.it/bar-restaurant/ and clicking the booking form button on the right hand side, a working example of the form can be found on http://waterfront.rudland.it/bar-restaurant-2/

Any help would be appreciated