Occasionally looking up a contact on Today's screen will return a wrong contact. For example, looking up John Smith will sometimes show 2 John Smith(s) but the 2nd one is actually a different contact. Why?
That's happened to me a few times. I've noticed it usually if I do a search the same time an over the air Exchange Activesync is occuring or right after. But like previously posted searching again, maybe a couple seconds after works.