In one of my multi site blogs i use event+ If I create

In one of my multi site blogs i use event+
If I create a headline ( f.e. h2 tag) there is no line break behind that tag,...
The same with h3-h5,...
The Headline looks like beeing integrated like a picture.
This is only happening in event+, nowhere else in all of my installations,
So i do not expect a tag or CSS problem,.. any ideas?
Jörg