The same plane?

Gents,I've been flying for a while now at areas where I'm not likely to see any other a/c. More recently, I've been trying out areas with more traffic. Here's the odd part: every other a/c I can see are the same type as me! If I'm a PMDG737, so are they! If I'm a DHC-7, so are every other a/c I see! I know it has to be the way my CLS and config is set, but I can't figure it out! HELP!Jim