If somebody writes an answer, deletes it, and undeletes it again, that answer will show up with one delete vote in /tools?tab=delete. This leads to the delete/undelete vote lists being flooded with such post, making it unusable. The lists get cluttered with posts I most of the time couldn't and shouldn't vote on.
Posts should only show up in the delete/undelete vote lists if somebody else than the owner cast these votes.