bug (?) in calendar display: HTML-tags after scrolling

When I hover on a date in the calendar which includes an event, the title and content are displayed. Everything OK. See image "before.jpg" in attachements.

When scrolling to the next month and back, hovering over the same date gives title and content PLUS surrounding HTML-tags. Ugly!!! See image "after.jpg" in attachements.

What can I do to correct this???

Greetings
Martin

Sorry, I can't reproduce your problem: so I suggest, you have some extra template or plugin which interferes with JEM (and Joomla). Can you try with a clean Joomla and e.g. protostar template!