I'm not familiar with that box, but I'm sure others here will be able to help more.
Perhaps the dceoder only scanned one transponder?
If it has blindscan, do that when aligned on a particular satellite with details of that sat entered into the decoder.
I wouldn't assume just becuase the box has presets for some sats, that they are accurate.... things change.
The box will need to be configured to communicate with the positioner, which should be covered in the manual.
I'm sure others will add to this.