Need help with traktor

Need help with traktor

Hey everyone ive only been djing for about 6 months. I use traktor pro2 and a numark mixtrack pro. Last week i tried to practice but whenever i crossfade to the right the bass on deck a increases. when i crossfade to the left it decreases.. ive tried several mappings and it hasnt helped. not sure what to any ideas???

i think it keeps reverting to the default traktor mapping as opposed to the mixtrack pro mappings..