There were changes in recent versions of Chrome which introduced this behaviour, and there was something similar happening with iOS at one point.
We added some changes in XF 2.1.1 to attempt to workaround this though, and for me they are generally working.
You seem to be running XF 2.1.1 right now. Is this still happening?
If so, can you let us know which browser/OS/versions you are using?