How to get the model right in MSFS

I have noticed times where a friend is flying the FA18 or a B787 and I am also flying the same plane and see the other plane as a single engine piper or something similar.

We both have the MSFS Deluxe Version and neither of us have any additional aircraft downloads.
I see myself as a FA18 and he sees me as a little prop job… We both have an empty community folder.

I suppose we have something set incorrectly ? Surely this cannot be this hard to render the correct planes since we both have exactly the same stock aircraft and are running the same version of MSFS.
What in the world have we set incorrectly.