Al could be onto something. I forgot to mention about the 110 lnbf could be picking up 119, which would mean that the elevation is too high, it needs to be dropped in order to see it on the 110 lnbf. I have done this myself several times when trying to find a signal, and this can happen even if you have your skew set correctly and your mast is plumb on all sides.
You can tell if you are receiving the 119 satellite on the 110 side if you look on the plastic Y peice and you lose the signal coming in from 119 if you cover up the 110 side which is on the left facing the dish.
Couldn't the left side that is 110 on a twin still pick up 119 before the switch test is done on the receiver that does not have any 110 satellite on the matrix? A switch test may have to be done in order to even see that the 110 satellite is coming in if you are receiving 119 from the 119 side.
Left side facing dish is 110, right side facing dish is 119. Cover up left side, if the signal is still coming in (from 119) then you know you are receiving 119 from the correct side, if not then you know that you are receiving it from the wrong side.
If you cover up the right side and the signal goes out then you know that the signal is coming from the correct side but if the signal is still coming in then it is not coming in on the correct side.
If you dropped the elevation of the dish by 3 degrees and turned it to the right slightly, if it was coming in on the wrong side, then it should come in on the correct side.
Also the dish may have trees blocking the signal from 110 but not from 119.