The number of cables attached are detected at installation and all recording logic is bases upon that number.
Any changew to the number of feeds should be followed by a reset to default. Take a poicture of your recording schedule as you will need to re-input this. Recordings will be saved.
Note at the foot of the signal page it clearly shows is thinks it has two feeds.
As you found out a single cable should be attached to LNB1.
On your Foxsat you will also need to connect LNB1 OUT to LNB2 IN.
Foxsat logic assumes this. The Foxsat also needs a factory reset to default.