IK Retargeter Exported Animation Is Not Working Properly in UE5.5.4

I followed a tutorial where they added a root bone to the Mixamo skeleton to fix export issues, and in the IK Retargeter everything looks fine – the animations play as expected.

However, after I export the retargeted animations and assign them to my Skeletal Mesh, the character appears lying face-down on the ground during playback. The animation is playing, but the character’s position and orientation seem completely off.
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I tried rotating the root bone, and even the pelvis (hips) bone, but the exported animation still results in the character lying on the ground.

I’m wondering – is there something I’m missing during export or retarget setup?

Any help or suggestions would be greatly appreciated!