Why do I often find my answers mere minutes after posting? :)
It appears that all of the fields in between 7 and 18 were configured to not be enterable in Browse mode or were calc fields (which you can't tab into in browse mode apparently). Hence it ended up landing on 18. Sheesh! I repointed #8 to be a field at the left side of the layout and things are working well now.
Hey that's the best way. But don't feel bad for posting, someone else in the same situation will benefit from your post and answer.