Some songs sound too fast or too slow!

The song has been time stretched too much. If the song has been time stretched, it will have on of the following symbols next to it.

This track has been time stretched
This track has been time stretched from 10% to 20%
This track has been time stretched more than 20% (It may sound wrong.)

To turn off beatmatching, click on the "DJ Fader" icon and uncheck beatmatching in the DJ Fader dialog. Alternatively, you can turn off beat matching for each song, by selecting the song and choosing "Edit BPM/Pitch Settings..." from the "Song List" menu. Uncheck "Beat Match" and click OK.