Buttons not responding (Change View, Selecting Tag…)

Hi,
I run into problem using the calendar as configured on my site https://streetphototip.com/calendar/

Add to Calendar Button inside an Event does nothing.

In Agenda View in the top bar menu the following buttons do nothing:
– Select a Tag
– Collapse All
– Expand All
– Change Calendar View from Agenda to Month, etc

On the other hand, when I click on a Tag on the bottom of an Event, the Tag filter works normally?!

I deactivated plugins and tried different advanced plugin settings to no response. I also uninstalled and reactivated the plugin but no luck either.

Any advice appreciated!

The page I need help with: [log in to see the link]