Its hard to say for sure without seeing how they wired your unit. If they have 2 coax ports outside with one marked sat, sometimes you have to connect a jumper inside the unit. Usually though, that exact situation you describe is caused by a splitter in the wiring which is not a power pass splitter somewhere between the receiver and dish. Any splitter between receiver and dish has to be power pass.
is it possible that the cables got switched at one end or the other at some point? put a dead end connection on one end and get an ohm meter and see whats connected to what. By dead end connection I mean hook a short cable on one end and jump the connection between the middle coax wire and the outside. So, when you use an ohm meter on the other end, it will complete the circuit and tell you what's connected to what. If you get no movement on either then your cable has been shorted, or cut some where in between, thus you'll need to run new cable. Good luck.
2016 Ford F250 Crew Cab 6.2 L w/Ride Rite Air Leveling System.
2017 Rockwood Signature Ultra Lite 8335BSS