that means that either the item is configured wrong, or your plugins are messing with the engine.
to check both options, please give us a screenshot of the item in the database, and screenshots of your plugin manager listing all plugins and their order.
then we can check for the possible causes.
and the item shows the reason why you got the wrong marker
The plugins you're using most probably default to HP if there is nothing set in the damage formula.
I suggest setting the damage effect to "MP Recover" and use the damage formula instead of the effect window, that should solve your problem.
It's always a good idea to refresh yourself on what your plugins do. I'm working on a map with opening walls, and I was about to tear my hair out over how much image editing and hand-constructing of autotiles I'd have to do, when I looked again and saw @Shaz 's Tile Changer could copy areas from another map.