Characters do not sit on floor

With all my characters, I have the following issue: they start nicely on the floor but then either float a bit above the ground or they fall a bit down the floor

Before pressing play

After pressing play

I tried everything including perfectly alligning the colliders (wich is really hard with a character controller due tot the capsule shape)

Could be an animation issue. Take a look if the root bone has any keyframes that move it down.