Apologies that we were not able to reply back earlier.
Here are messages from rekordbox engineering team.
That device emits strobe light at regular intervals.
The RB-DMX1 can control its strobe light interval and its brightness, so it seems that it is operating normally.
"FAST / MIDDLE / SLOW --STROBE" in PERFORMANCE mode controls the Strobing effects other than Strobe category all together.
The order of the DMX chains doesn't matter.
Pioneer DJ Support