Wrong levels displayed on DDJ-1000 (Firmware V1.12, Rekordbox 6.6.4)

The channels on my DDJ-1000 show diffrent levels.
When I loop the same song on two channels and let them play simultaneously the displayed levels for each channel are diffrent. However the songs seem to be equally loud on the diffrent channels.
This is a huge problem since i cant play live when i cant rely on the displayed levels... I cant even rely on my master level...

I need a quick solution for this, since i have two gigs next weekend.

PS: Im using the DDJ-1000 with the latest Firmware Update (V1.12) and the latest Rekordbox Software (6.6.4).