Unexpected sphere collision on skeletal mesh with floating pawn movement

I’m trying to make movement on a skeletal mesh (as root component) with a floating pawn movement. When the sk mesh hit something when moving with FP movement input vector, the collision seems to become a sphere and ignored the physics asset of the sk mesh.
How can I use physics asset to detect collision? Thank you very much!

The image shows sk mesh falling (accepting minus z input) with different initial rotation. Blue spark shows the colliding location.