So I initially up voted then it turns out the deal was ****. So I revoked and when I tried to downvote it I get this message:
"You have already voted on this deal. Your vote was subsequently revoked"
Any reason for doing this? It's a weird site policy
You can revoke your up vote.
Many times when I try to up vote a comment on my phone, I accidentally tap minus instead of plus but it seems you can't change those votes either.