You quite often get a slight drift depending on the latency on your soundcard.
If the track stays in time with the music, you can maximise the track (the + magnify button) and just drag it into the right place.
If the timing gets more "off" as the song goes on, I know theres a setting somewhere in CEP to compensate for that, but I can't think where it is....
I'll have a think on it, maybe it'll come to me....