When you turn the encoders does it have a value displayed in the LEDs top right?
(This display can be turned off, so no display is no big deal, but if there is, it would indicate that there is something in the preset)
Go into edit mode from the front panel (hold the EDIT button and then twist the encoder you want to edit then release them)
Twist encoder 1 (top left) to select CC , enc2 to select a channel, enc3 set to 7, enc4 set to 0, enc5 set to 127, enc 6 to abs(solute) and enc 8 to turn on the display.
Push EXIT and see if you get values displayed and Midi out as you twist the control.
I hope that is all it is.
All the best
Royce