Possible bug.. Search Users showing multiple entries for same user

I've just spotted in my search user page, duplicate listings for users.. one with an ip entry, one with a none...

user name1 email address Active xxx.xxx.xxx.xxx May 03, 2010 Apr 12, 2010 Block User Ban IP
user name1 email address Active None May 03, 2010 Apr 12, 2010 Block User
user name2 email address Active xxx.xxx.xxx.xxx May 03, 2010 Apr 12, 2010 Block User Ban IP
user name3 email address Active xxx.xxx.xxx.xxx May 03, 2010 Apr 12, 2010 Block User Ban IP
user name3 email address Active None May 03, 2010 Apr 12, 2010 Block User
user name4 email address Active xxx.xxx.xxx.xxx May 03, 2010 Apr 12, 2010 Block User Ban IP
user name5 email address Active xxx.xxx.xxx.xxx May 03, 2010 Apr 12, 2010 Block User Ban IP
user name6 email address Active xxx.xxx.xxx.xxx May 03, 2010 Apr 12, 2010 Block User Ban IP
user name6 email address Active None May 03, 2010 Apr 12, 2010 Block User

its not every user.. but it's kinda odd how it's hit and miss on which ones are being duplicated.. Will keep an eye on it and see if it stays the same or if it varies after some time.. Not a major issue, but one of those, scratch your head and go.. "why is it doing this?" moments