A couple of days ago I only got 10 rep for an accepted answer (which now that I think about it, could be moved to superuser :) ) on stackoverflow with 1 upvote. My rep went from 201 to 211.
No Questions and the only Community Wiki answer is "How can I help my poor friend learning to program?" with 2 upvotes.
My current rep should be 236 (16 upvotes + 5 accepted answers + startrep(1)) instead of 221. The reputation chart seems to show the right reputation.
The bug appeared about 48 hours ago. I went through the faq and meta.stackoverflow and couldn't find an explanation for the missing 15 points except for the daily repcap that I did not exceed.
Edit: The solution to the Problem was a rep recalc. Why the bug appeared is still a mystery to me.