Yes can't really say what causes it. Did some more tests with goblins. Some of em died and I let em reg up to full again. First thing that I noticed was, that they didnt reg in 10 HP/s steps anymore after some time, but regged very strange numbers. Also after they regged fully. this problem occured. This time not HP missing but extra HP. Goblinhealth1.jpgGoblinhealth2.jpgGoblinhealth3.jpg
. Guess it's more HP related to how many goblins died and revived in the squad.
Also did another test related to the strange numbers the units started to regenerate. I rode over some Pikeman in Viewmode to evenly damage these knights. CavalryReg.jpg
After some time they started regenerating strange numbers too. It was not 10hp/s per unit anymore, but something different.