Dmx Light Palyer makes makes my LED co2 jet lights flash

Can someone help me when using my Velleman DMX interface on my LED Co2 jet the leds flash when are supposed to be solid colours, has anyone else had this problem?? The co2 jet is 2 channel first channel fires the co2 and the 2nd channel changes the colour of the leds.

Need help ASAP

Paul AFU :neutral_face: