Shulk Armour points dont stack with diamond armour or above

Or just with iron, it doesn't stack.

I opened a new issue ticket where I did some testing and found out that actually when you put on iron armor on a shulk you take more damage than an unarmored human. There seems to be some kind of bug whilst stacking armor as you take more damage the more armor you have. Not sure if you guys faced this issue exactly.