problem dimming led with EUROLITE EDX4RT

[zzboom]

Hello, I'm tryin to use this EUROLITE EDX4RT with led light, but with dmx signal at 0, lights remain still a little bit on; at about 30% they start flickering. Seems that someone opened it yet ( 2 Triac BTA16, 2 Triac BTA139 ). Can u guys suggest something?( I can't put an incandescent lamp to solve this situation)

video: https://files.fm/f/utg33j78d
thanks!