Rekordbox 6 & DJM750 Mixer - Fader LED's

Just a quick one but I have been really struggling with this, my setup ....

2 x CDJ 2000

1 x DJM 750 Mixer

Mac running Rekordbox 6 in Performance mode, all connected with USB hubs.

I have connected the CDJ to the mixer with phone cable and I have line selected on channel 2 & 3. I can connect both CDJ to Rekordbox in HID mode as decks 1 and 2, I installed the aggregator selected that under preferences and external, all is good

The problem is the up faders on the DJM work so the volume goes up and down as they should for that channel BUT the LED lights stay on, even with the fader down on zero, the LEDS for that channel remain the same, the master output leds change but not the individual channel fader light which just stay on

Everything else in fine all the EQ's work, effects etc

Any ideas I am at my wits end :(