No sound on left channel mixvibes u-mix44

Hello, im using u-mix44 on 2 vinyl turntables and a mixer
I connected everything in the right way and all settings are how to need to be.
The right channel is working allright but the left channel isnt, i can control the channel with my mixvibes vinyl on my turntable and the gain in Cross DJ shows also there is sound but on my mixer it isnt and i dont hear any sound. The output 2 light is on but the output 1 light is turned off on the u-mixx44.
Im using Cross 3.3.11 32bit (also tryed 64bit)
Does anyone know what the problem is ?! Thanks a lot !
I connected everything in the right way and all settings are how to need to be.
The right channel is working allright but the left channel isnt, i can control the channel with my mixvibes vinyl on my turntable and the gain in Cross DJ shows also there is sound but on my mixer it isnt and i dont hear any sound. The output 2 light is on but the output 1 light is turned off on the u-mixx44.
Im using Cross 3.3.11 32bit (also tryed 64bit)
Does anyone know what the problem is ?! Thanks a lot !