When you’re in Reaper Form and transition to a new screen, the game automatically removes Reaper Form from your character.
Naturally this would be fine, except that it just assumes that your health is the same. I can leave an area in Reaper form with 100 hp and I’ll have 100 hp at the start of the next area. I would expect Reaper Form to either persist between zones, or have the game remove it naturally so I can go to the next area with full hp.
It’s not only Reaper Form, although in your case there is also the health thing, but in generell transformations tend to end whenever u enter a new area, I’ve got this issue with the druid, I enter new area as werebear, I appear in new area in human form, just as annoying as all the skills with cooldowns actually going on cooldown whenever you enter a new area.