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i reckon it could be 2 things
1- 20m of wire is ludicrous, use shorter wires, it might not affect it much but its enough to fuck you off 
2- theres a problem with your mixers cue signal/output signals, what mixer have you got? is it worth getting fixed? does it have master jacks out? (1/4" mono jack) in which case, plug one set of headfones in the normal headfone socket, and the other in one of the master jacks, listen to one in each ear. if it still lags then its your mixer thats fucked.
if you havent got jack output, then try straggling the master outputs.. put one of your rca wires that go to your amp in the red 'master' and the other in the white 'record' output (the names may differ depending on what mixer you have, but most have 2 outputs). if you do this, you will be able to tell if one output is lagging behgind the other, and then you can plug your rca wires into the one that matches the sound from your headfones
hope this helps 
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MUGGETS
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