Weight paint different from Blender

Making character in Blender with Rigify. Imported as usual… In animations i noticed on my tail is bending so bad… i assuming this is problem in weight paint. I think in blender and unreal engine they are applying weight paint differently, in UE weight paint applying little harder… probably. And i noticed, my tail is going through neck a little bit, in blender perfectly fine. What is happening?

Some info:

  • My rig named: rig (i tried name it Armature, but some weird stuff was happening)
  • I enabled export only deform bones.
  • Units in blender Metric 1 Meters, i think its not the problem.