Health bars often times do not show, which makes it difficult to track who needs to be healed during an event that affects the health of a dweller, like a raider attack, a radroach attack (which drains the health of a dweller quickly), a mole rat attack, or a fire event. Other times, it is the opposite that happens, health bars do not get hidden, which makes it annoying and feels out of place (but perhaps this is just because I am somewhat obsessive compulsive when it comes to these things). I would like to admit, though, that the latter is more bearable compared to the former, which I wish would be resolved as soon as possible.