Problem with the frontend form and navigation arrows

Hello,
We have a problem with the frontend form and navigation arrows.
It was ok at the beginning when we installed the plugin but since 1 month, when you click on the ? Proposer votre événement / Post your event ? button, it’s very long to open and it’s very painful.
And if you use arrows to go to the next month, and then you click on the ? Post your event ? button, it doesn’t work.

We made the update of the plugin but we have always the problem.

Could you please help us to close this issue ?

Thanks
Laurent

https://www.ads-software.com/plugins/all-in-one-event-calendar/