You've got some level 5 heroes, so you should know well enough that of COURSE it's intended to happen. The game doesn't like you

When you get a pair of quirks like that, you pretty much have to clear one out, or you're going to have to rely on passive weekly stress heal, or in-dungeon heal with someone like a Jester. Personally, I find I don't have to heal stress in town all that often, but that's partially because Jester is one of my favorite classes even apart from his Stress heal, so I have plenty of stress heal on hand.