5.3.0 bug with skeleton mesh & physics assets

I’ve imported a skeleton asset from Blender but it seems unreal that the engine will automatically create some physics asset for the skeleton mesh which is totally fine, BUT: the physics asset is so broken that characters will collide with each other so they could launch each other as rockets if you put them close enough. I’ve tried to make a new physics asset and delete everything in the physics asset. THE COLLISIONS are still there even if I assigned the generated new physics asset and delete everything inside of it… Pls help

Here’s how the bug looks like

Here’s the evidence of all the settings of physics asset, character mesh collision preset, including assigned physics asset of this particular enemy…