I am wondering if anyone knows how this works. I have just deleted a lot of post from this one member because it was like spam. But the total post count on the forum and for the member still remains unchanged. I am using IPB Board.
Post counts don't go down when you delete posts, because members don't like seeing their post count decrease. If you do a recount in the ACP it will recount everything and fix it, though.
I don't use IPB and I'm glad I don't now. That's a load of rubbish, if a post is deleted it must be for a valid reason so sod them. If they don't like their post count to go down, they shouldn't post stuff that might be deleted.
The posts may have been automatically moved to the "Board Trash" and must have not been completely deleted. Check through your board trash to see if it has been deleted or not. If you do not have a board trash, then: Is the best answer.