RigidBody turns weird after interacting with other rigidbodys?

i know two questions in a hour, sue me.

in my tank game, when my tank collides with let's say a cube. the tanks handling is reduce, in the sense of that, the pivot point, from where it's turning changes, and that the tank does like a michel jackson moon walk thingy, when it rotates. this also happens when it nearly fall off the table. (TableTopTanks)

any help?

my tank is has just a box collider and a rigid body.

Try click Freeze Rotation in the inspector for your rigidbody