Mixamo to metahuman retarget bug

Hello I have a bug with one specific animation from mixamo,

I am using unreal 5.7.2,

I downloaded the animation “flair” from mixamo did th ik rig, auto-lign and retarget, on the preview everything looks fine:

but the exported result has 1 from at the begining and one at the end with a t pos creating this weird result:

I tried with another mixamo animation and everything was fine,

Anyone has any idea ?

Thanks in advance