Imported FBX Skeletal Mesh is Incorrectly Deformed

I made a rigged model in Blender and I’m trying to get it to work in UE4, but when I export it as a binary FBX and import it into the engine, some areas of the model are deformed incorrectly. The weird thing is though, if I export from Blender as an ASCII FBX, the deformation is as expected. What could be causing this?

You can see my problem in this picture (Left is the ASCII FBX Skeletal Mesh, which looks just like it does in Blender, and the right is the Binary FBX Skeletal Mesh, which is deformed incorrectly.):