Problem with floating pawn actor flying into the air


So I am having a problem with a tank shooter template I made in blueprints. Everything seems to work fine except for my floating pawn actors (the actual tanks), they seem to have very little mass and can sometimes just flip over from some minor bumps in the navmesh. Also the fast projectiles coming from the machinegun or cannon can just make a tank actor just fly into the air at high speed.

in seconds 0:25 you can see the problem, and it happens randomly, in very rare occasions, usually 1 on the 10 simulations i run