There is no way to mark a question with an accepted answer if there isn't an answer to accept in the first place, so those questions shouldn't count into your accept rate at all.
You do have at least one question with an unaccepted answer. You can always mark that as accepted if you think it's good enough for you, then that'll bump your accept rate up to max. It's not required, though, so don't worry even if you decide not to accept it. Just remember to do this for any questions you have with answers that help you.
For what it's worth, an accept rate of 80% is really good. If it puts perfectionists off, that's their problem.