At some stations those player entered and left messages are repeated a couple of times.

Here's an example:
[Sun Jul 19 23:46:27 2009] mr_spuck has entered the room.
[Sun Jul 19 23:46:27 2009] mr_spuck has entered the room.
[Sun Jul 19 23:46:27 2009] mr_spuck has entered the room.
[Sun Jul 19 23:46:49 2009] mr_spuck has left the room.
[Sun Jul 19 23:46:49 2009] mr_spuck has left the room.
[Sun Jul 19 23:46:49 2009] mr_spuck has left the room.

seconded. Last one I saw was in Odia M-14. An NPC or player entering would generate dozens of notifications in the bar.

Yeah, we're working on this. It's some sort of odd client bug. Thanks for the additional reports.