I am not sure why, but I did the change to duplicates for all channels. All the other channels duplicated but not the locals. We used to have a two dish setup but they disconnected it last year. FYI-All my tv's are HD so I do not know if maybe the installer knew that and just installed a single dish. I'm not mad at anyone just troubleshooting with a lot of people here that have far more knowledge. I would never try to get through to Customer service for that with all the problems they are dealing with.
You are in an MPEG4 Market there are no SD locals. Everyone with that second dish who hasn't upgraded to MPEG4(HD) is without any locals or will be soon.