Have a read through this thread, it sounds like it is a known issue that Riot is working on:
http://www.leagueoflegends.com/board/showthread.php?p=2198958#post2198958
http://www.leagueoflegends.com/board/showthread.php?p=2198958#post2198958
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So I seem to have lost over 2000 IP during the time I i was off from 29th july to this point (account: sonatar).
I had abrox 6900 when left yesterday. Today played a game (which was victorius) and after that noticed me IP being at 4400, then relogged, it showed at 7020, but when tryed to purchace champ, it counted me having 4800, now after second relog shows me have 4685 IP. Any fix for this?
PS. Same happened to my friend aswell (account: Silverose).
-Sonatar