Massive HP decrease of converted higher Level Thralls?

Game mode: Online
Problem: Misc
Region: United States (America)

From what I know so far higher level thralls such as level 2 and level 3 npcs have lower health pool from their base value of 700 or something. Like this converted thrall hp is 104 of 700 or another number but I only used the Truncheon and not anyone other weapon in my attempts to knock him out and convert him. After the conversion the hp of the thrall is too low . Why is this happening? Anyone know?

Thralls start with ~100 health after being converted and are supposed to regenerate health over time. But they are not. The thrall system, a large chunk of the game, is currently not functioning correctly. If you get thralls, I’d highly recommend getting the rank 1 thralls rather than high ranked thralls due to the fact that, in the games current state, there is no significant difference between the two aside from the fact that rank 1 thralls are converted much quicker.