The bug I noticed actually is in profile pages AND last-online list
The last online list looks like it shows users at random, meaning not all visitors are added (even days after they visited)
In their profile the date of their last visit is also not updated
Example user(s):
One (MajickDev) or both users in this post was online same time I was but never added to the list and in his profile it still says he last visited 1.5 year ago!
http://www.icyphoenix.com/viewtopic.php?f=19&t=8249
I'm sure he visited at least twice on Sun 27 Nov, 2011
EDIT: I mean the last online list here:
http://www.icyphoenix.com/viewonline.php