Hello,
First of all, I have no prior knowledge of blender. I am trying to export a model from blender and import it to UE5. Most of the parts of the model work fine but a few part’s transform breaks in UE5. I would love to know where the culprit is.
Thank you in advance. 
Hey, are the broken parts “children” of any “driver” objects?
It would make sense, that these parts of the wings can be controlled by a Empty-Object or any other Driver-Element in Blender to Rotate/Move all of the individual parts at the same time with one “Parent” Element or Armature.
If so and it is NOT important to keep these relations: select everything (a) - press alt+p and select “clear and keep transformation”. Now everything should be at the highest level of Hirachy. Export fbx as usual.
Make sure: Export → Geometry Tab - Smoothing from “Normals Only” to “Faces”
Armature Tab → Uncheck “Add Leafbones”
