Continuing the discussion from Moving the first post to a different topic doesn't actually move the post, it copies it:
I think the same thing is happening with poll votes, which I think is a bug. If you create a poll in the first post in a topic, then move that post into another topic, the votes disappear in the poll at its new location. Meanwhile, a copy of the post (with votes) remains behind in the original topic.
Took me a while to figure out what the heck was going on there. If this is not possible to do, some sort of error message or warning to the moderator seems to be needed. We just spent alot of time troubleshooting because the move did not work as expected.