Here, this is the model I made, "RightMainBayBone" is rotated and it rotates connected meshes:
In Blender, it works fine. But when I imported in Unity and rotate the bone, it also rotate other meshes:
Rotating Left Bone doesn't make this problem.
I exported as FBX with apply transform option.
I think this is Unity's problem but I'm not sure, because there might be something I missed.
Any advice will very appreciate it.
p.s. There's no parented bone.