I have an armature which has a root bone on the ground, and then the spine bone is parented to it as well as the ik bones that I don’t export. And basically you can see what happens on my image, in this test animation (cause I noticed this in another animation), the armature moves twice the distance of the root bone. I do not know what causes this.
I tried a different setup where instead of parenting the spine to the root, I use the copy location constraint, but nothing changed.
Also this is Blender