Car collision seup problem

Hi i got a problem when i use the sedan BP with another car skeleton mesh.
I have setup correctly the physics assets :

But when i start playing the car roll like if the collisons where a sphere .
I have found a green circle in the BP i think that the reason of my problem here it is:

How can i remove it ?

Here is a screen of the problem ingame:

Please help me thanks !

Sorry if bd English i am

Have a good day