Physics Mass Issue UE4

I’ve a big physics issue : the mass of an object doesn’t change the player ease to move it.
Here is a video : UE4 Mass Issue - YouTube
As you can see the mass of the left cube is really huge but the player can still move it.
Btw the mass of the player character is 71kg.

Thanks by advance and have a beautiful day :slight_smile:

Sorry for the up but the problem is persistent and I really need to fix it^^.