That won't be a problem with the keyboard but is some sort of problem on the computer side. I'm guessing it is something to to with the Voyetra software as that is responsible for playing back the recorded tracks in sync the same way as when you recorded it. In the meantime can you fix the problem in the sequence by simply dragging the newly recorded problem tracks back in time to where they really should start ? It maybe annoying to have to do this each time you record a track but that would at least solve the problem until you work out what is really wrong.