Why my avatar does not have the walking animation in fullbody

everything looks fine in PC mode or 4 point tracking.
but.if i use it in full body.then it would just slide away without making any movements.
especially when i have already selected the “Force locomotion animation for 6 point tracking”.
it appears to be kinda weird and i have no idea where to start.
i did use the “Avatar tools” on booth to combine different materials.since the UV is totally messed up in blender.5 models included,they all have same amature.only with different materials and body parts.

in case whether there are any people wanna know about how the actual structure of this avatar.
i have to say it has three “bodys”,and they are all the same.i dont know if that’s the reason why it works like this in full body tracking.