for some reason in the begining of an event my son informed me the cue slider was working funny, when slider was at pgm 2 position i could hear whatever was playing on pgm 2, when i slid it to pgm 1 I would hear whatever was on pgm 1 momentarily then it would fade out for some reason?, when i slid it to pgm 2 i could hear pgm2 just fine, it was only when i slid to pgm 1 did it act strange. I turned the mixer off then on again & problems was solved. Is there something wrong or did my son activate some kind of feature by accident?