Skeletal Mesh Component Physics MassInKg changes itself

When I add Skeletal mesh component and set it’s physics MassInKg and then click enter or click anywhere it changes. I’m using UE4.15.2. Tried to reboot without success.

Amount of change depends on used mesh.
When using MannequinHand_Right given in vr template mass is multiplying by 16. When using some other mesh, it multiplies by 2. Worst are the ones that changes mass by very big amount. One mesh’s mass, after applying it changes to be mass/10000000…

It’s working as it should in 4.18.1