Deleted posts still displayed for approvement

I logged in as a usual user. I added a post within a moderated topic. The post was set "waiting for approval". I deleted the post. I added one more. I logoff'ed and logged in as Moderator. In the Dashboard there are 4 items for review. Of course, in the topic there is only one item to be approved, so 2 items remain for ever in the Moderator's Dashboard.