Mmm never has this happened for me running it 5 times a day... However... I rarely leave the arena without finishing it so I can't be sure.
If you zone out to Grahatwood, log out and log back in, telelport to Maelstrom does it take you to stage one?
OMFG I know what's happening LOL.
You've either got it set to normal or vet which ever way you're not doing it.
So if you have it on normal and you went back in to continue VET this is what happens, go out and change the vet/normal around. Hehe