Falling into floor

Edit: The problem has been resolved.

I am wondering why an asset store Skeleton is falling into the floor when starting the game. The asset is fully rigged, animated and has a controller. The .FBX version of the asset does not fall into the floor. I have seen some videos related to creating character controllers etc, but do not think the appertain to my current problem.

Please see the video provided.

Thank you in advance.

 

Make sure, that the skeleton is not in the ground, when the scene starts or the collider is big enough for him