Hi Kelley,
Thank you for your support,
I have already import my character to Mixamo,
But when i download it still character have the same feature,
Regards,

I don't think any of us are going to be able to help you here -- I just tried it in Mixamo and it worked just fine (the distortion around the waist is a problem, though with the standard Mixamo rigging).

You will need to learn how to rig a character and that's not really something we can teach you here.  Luckily there are lots of online tutorials on this process, so I would suggest you do a web search.  In the meantime I've attached the iClone Mixamo rigged character (again, with waist distortion -- this is because that's the best the auto rigging of Mixamo can do.  You will want to learn the proper way to rig and weight your characters).

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Alienware Aurora R16, Win 11, i9-149000KF, 3.20GHz CPU, 64GB RAM, RTX 4090 (24GB), Samsung 870 Pro 8TB, Gen3 MVNe M-2 SSD, 4TBx2, 39" Alienware Widescreen Monitor
Mike "ex-genius" Kelley

Hi Kelley,
Thank you for your support once again,
Regards.