Thanks for the tips boys.
Sorry for my ENGLISH.
Idk why my imgs didn’t uploaded…
On tail, between bones influence has only two. There is some parts on my mesh where is influence up to 8 (around the face) and some even more than 8 but with many 0 weights, but still it shouldn’t affect tail.
Also checked it, i don’t have any weight on control bones or any deform bones which can deform like that.
Also there is not any deform modifiers, in Rigify they being driven by control bones through Bone Constraint, like Copy Rotation, Copy Transform etc. idk if this the problem…
Thereover some bones in unreal seems different. But i assuming this is how unreal generate skeleton… or is it the problem???
About retargeting idk much, i don’t using root motion nor some specific settings just preview raw animation in UE.
Is naming bones some specific name like “Armature” make do stuff? I will try using Auto Rig Pro instead Rigify.