Hi Steen,
Welcome to our support forums, and thanks for reaching out. Hope to make this right soon!
In the source code of the page you shared with me, I’m seeing that the view is recognizing there are events for Friday 31 -you can see the column header is linked to that day view as opposed to other that are not linked at all- but the actual event is not there. I only see recurring events in your site, can you try adding an non-recurrent event so we can see if this issue is just happening with recurring events?
Also to discard any possible conflicts with other plugins or with the theme, Can you please go over the steps described in our Testing for conflicts guide?
Please let me know about those,
Best,
Nico