Hi Julian!
So sorry you’re having the problem! It looks like the tooltips have been commented out and are appearing inside the month grid on hover. I can see how that would be frustrating.
Let’s start by having you go through this guide in our Knowledgebase -> https://theeventscalendar.com/knowledgebase/testing-for-conflicts/
This will help to rule out any theme or plugin conflicts and depending on what we find out there we can begin to narrow down what’s causing this issue and get you fixed up asap!
Let me know what you find out!
Cheers,
Trisha