i think you have the diplexor backwards. you make a wishbone with the diplexors, sat side goes to the dish, then to the receiver it isn't dishnetwork dual receivers so there really shouldn't be a problem...........LET ME ASK YOU THIS.......you seem to be a cable guy, where did you get the diplexors? i know that when i did cable i'd scavenge them from sub's houses when i took them off a dish, but when i started doing dish i realized that diplexors for the most part are very cheap........i've had maybe 2 spitters in my life that were bad from the box, but diplexors i used the best i coiuld find (eagle aspens always worked great) but i still had about a 5 percent fail rate. did you try swapping the diplexors?
This is CABL.com posting #180638. Tiny Link: cabl.co/mU9G