Sometimes the shown hovercard doesn't disappear. That's very annoying and I have to reload the page or hover some other link to get the card away.
Topic on Talk:Page Previews/Flow
This bug is tracked at phab:T92932. Thanks for the report.
The problem also occurs with Firefox/37.0.
I also frequently get a hovercard that doesn't disappear unless I hover over another link (in which case it will successfully clear almost 100% of the time). I'm on Chrome v 42.0.xxxx. In spite of the bug, this is a great beta product which I constantly use.
Happens also with Safari — Version 5.0.6 (5533.22.3).
This problem also occurs on Opera version 29.0.1795.60
The problem also occurs with Firefox version 38.0.5.
Still happening in Chrome. Very annoying