Character import - Animation Problem

Hi, I am trying to exchange a Robo Recall character.
I have exported the skeletal Mesh as FBX and imported again without modifications, and the Animations ingame are faulty (with a custom mesh and rig, with Maya 2018, the same thing happens).

the animations in the animation editor look good.

But if i exchange the Skeletal Mesh in the BP Class, some animations ingame are good and some are bad: