object bugs?

while i was playing i noticed that there were skidmarks in the air
and when i drove on it this happend (check screenshot)
this happens on all objects on gridmap i noticed
is this a bug or wha?

 

This happens with mostly all objects. This is no bug, it is what people call a "rect" or "rectangular" collision zone. Basically, it is an invisible shield that allows you to collide with the mesh. Otherwise, if this was not here, you would just drive through the mesh. Sometimes, if you are near a tree, a shadow from your car can actually cast onto the rectangle, enabling you to see it. The rect collision makes the car interact with the mesh (crash into it). Therefore, this is not a bug; the creator of this mesh would just move the collision cube closer into the mesh. But I must say, you really have a good eye for detail!

 

yea i noticed this on like 90% of the objects in gridmap
lol