SL3 and Rekordbox - outputs 3, 4, 5, 6 no signal

Hi Team,

I am currently trying to use record box with my SL3 unit but i am not receiving and inputs into my DJM mixer for decks 2 and 3, these are being routed from outputs 3, 4, 5, and 6 but there is no signal coming into my mixer at all when I load tracks into record box and play them. Deck 1 however seems to working with no problems at all.  Please the the Audio outputs as per below.

I should also mention that i am running the latest versions of rekordbox and my SL3 firmware is up to date. Additionally, when i use Serato i have no problems and all but prefer to use Rekordbox.

Please let me know if I am missing something or if you have any solutions.

Kind regards,

James