CSS problem?

Using the event-list widget in the left sidebar with theme “zeeminty” hat the effect, that the events are always shown at the bottom, below the last article on the page.

I’m not sure where’s the problem, at event-list or the theme. But I would grateful appreciate any help to resolve this issue.

Here you can see the result live: http://www.gv-wuermersheim.de/

Thanks,
Michael

https://wordpress.org/plugins/event-list/