Reply to flat sound after ableton audio export

hello!
recently i decided to mash up heads will roll (atrak remix) and kidsos (wippenberg remix) to have something new instead of playing the atrak remix all the time.

however, after i exported the track and loaded it up in traktor, it sounded flat.



i don't know really what to do, i bought the .wav from kidsos but this didn't help either..

greets