Events in webpart Events not clickable

When i use the Events webpart on a hubsite (main) and configure the webpart with the option Source = All sites in the hub, the events is not clickable. With other words, the page with the event is not opening. 

when i change the option to this site, the clicking is working.

I tried to create the event webpart on a other page on the hub site, but same result.

Anyone an idea what is going wrong here and how i can solve this issue.