Grüetzi Stefan
Thanks for going Pro and welcome to our support forums! Let me help you out with this.
Indeed it looks a bit mixed up. It would help me to know how the separate events are set up and how the page that is showing them are set up.
Based on the code it looks like that the first 2 events are part of the map view loop. And the rest is … well … somehow thrown there.
I see that you only use one plugin apart from the Modern Tribe ones. Please run a test and deactivate that one (basically all non-Tribe plugins), switch to a default theme like twentysixteen and check if you still have the issue.
It could also be that there is some unfinished html code in one of the events description or title or extract? Please check that.
Could you also make a month view and a list view available? That might shed some light on things.
Looking forward to hearing the result and to help you solve this!
Schönen Abig
Andras