I've been deleting quite a few of my own questions on Area 51 when I realised they weren't good questions. Sometimes they were heavily voted but even so, the question wasn't actually a good one. I've just deleted a question on this proposal which had seven votes, but from the discussion I was seeing under the question, it looked like a bad question (i.e. something which wasn't going to attract experts). I've done this several times now but don't seem to see a hit on the reputation. Just wondering why the reputation doesn't go down along with the deleted question.
Reputation isn't recalculated when you delete a post.
If you run the reputation report - http://area51.stackexchange.com/reputation - you'll see your new correct reputation.
If you want to see the correct value on the site then you'll have to request a recalculation from the team.