Motion Matching Root Motion / RootBone Orientaton problem

Hello everyone.

I´m currently banging my head against the Motion Matching feature in UE 5.7.
I have bought an asset-pack with several creatures, which i now want to make controllable. I thought i could use Motion Matching for this to make things easier, but i can´t get the forward and backward animations to work.
In the screenshot i provided you can see, that the forward and backward trajectories are pointing to the side and are very short. The strafe anims show a long trajectory and they work fine when i play the character.
All the anims have root motion, and root motion and force root lock is enabled as you can see in the second screenshot.
What i think could be the problem is the wrong orientation of the root bone, as it´s Y axis is pointing down and Z points forward.
I think Y should be forward and Z should be up, like in the mannequin example, but how do i fix this?
I tried to edit skeleton in Unreal and re-orient the root bone of the skeleton (screenshot 2), which lead to rotated animations.
I then tried to fix the animations root bone rotation via ReOrientRootBoneModifier, which also does not quite work.

I really hope anyone has some genious tips to make this work, have a great day everyone! <3

Screenshot 1

Screenshot 2