If I have the MIDI Control Center set at "Knob Mode - Absolute" and hit "Send to Keyboard," it will set the KB to "Knob Mode - Relative" (go to Set Up > Global to verify). The reverse is true. If I have the MIDI Control Center set at "Knob Mode - Relative" and hit "Send to Keyboard," it will set the KB to "Knob Mode - Absolute" (again, go to Set Up > Global to verify).
I noticed this when I set the MIDI Control Center to "Default Values," which puts Knob Mode @ "Absolute" but changes the KB to "Relative" after sending it to the KB; it also defaulted the transport controls to values in the 50s, which is not how my KB was set up out of the box from Arturia. My KB then booted up this way every time I powered it up.
I was able to send all of the correct values to the KB by reversing the Absolute/Relative setting and resetting the transport controls to the proper numbers; it now boots up (I think) the way I got it out of the box so there is no issue, but hopefully this info is useful to other users and/or Arturia.