4950 unbuilt objects vs 1056 static meshes

Hi there,

all of a sudden Unreal is showing a lot more unbuilt objects than it was showing before. I have 1056 static meshes in the scene but its showing a lot more objects that have to be built. I have switched all meshes to moveable so the unbuilt count droped to zero. So I could see for example that a single meshes is causing 13 unbuilt objects when I enable it. Almost every mesh is causing multiple unbuilt objects altough they only consist from one mesh.
Anyone know whats causing this error?

Cheers