UE4 When Importing a mesh that has same verts on the same place it Merge it together

Hello People,
So Ive been working on a small little side projects, and I’ve made like a minecraft Rig and I wanted to import it into UE, problem is For some reason it merged all my mouth meshes together and all the shape keys are just broken and stuff
In UE

In Blender

the Mouth Mesh thingie

and the mouth is being controlled shape keys

So yeah, maybe someone could help out?
Thanks