Weird Flying Vehicles when using Bullet's vehicle preset with Panda3D

Im having a serious problem with panda3d and blender.
Despite having set physics, there is this specific collision mesh that keeps flying instead of being pulled down.
Egg file (collision mesh) that causes the problem to occur :

Found the answer :
The problem that caused the vehicle to misbehave was when the mesh was going through the wheels, but not completely … Just as we can see it in this picture :

and there was another case in which the mesh was completely englobing the four wheels which would at the end cause it to behave as a normal mesh falling down naturally.

So to sum-up, it only happened when the mesh was partially “going through” the wheels, whether it’s only one of them, or all 4 together

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