On submit redirect to blank page

Hi,

First thanks for the great job you do for so many years 🙂

Unfortunately I runned into an issue.
It seems there’s a javascript conflict with another plugin (EventOn).

If you go to this page (https://www.diveexploreindonesia.com/cruises/by-dates/), you will see a calendar with a “drop down” and inside a Contact Form. If you use it right after page load it works, but if you click on another month of the calendar or the right arrow, then when you submit the form, it redirect to :
https://www.diveexploreindonesia.com/cruises/by-dates/#wpcf7-f1994-p1254-o1

And there’s a blank page with just a “0” on the top left.

I googled everywhere but could not find a solution. (I tried desactivating JS in CF7 etc but without success.

All my theme etc are up to date and the plugin works fine on the other pages.

Please help 🙂

Thank you!

Fred.