Cube UV unwrap makes no sense

Hello everyone,

I am new to substance painter and am trying to auto UV unwrap a cube that I made in c4d. However, this produces an unexpected result. Instead of the 6 faces in a cross like structure that you would expect, my UV unwrap looks like this:

I was not able to use any import settings that made a difference. This is what I have now:

Lastly I attached the fbx file as well. Extremely curious what is going wrong here. You'd think that UV unwrapping the most basic cube would be an easy task but apparently not.