Does anyone know something about physics material in unreal?

[margon]

I have a ball that use a piston to push itself to roll.

However for some reason the friction is different on different surfaces, but its on an old project and all the old surfaces are fine, but any new surface will be different.

All of the settings on the surfaces are the same, even use the same texture and physics material.

the object file is the same as well.

would really love if could someone help me out, for my whole game doesn't work without it.

Thanks.