I’ve just re-read your initial question to try and understand further.
I think I understand @Joe_Salmi. You are rendering out all the tracks and getting silences at the start and end of anything on track 2, 3, 4 etc. Correct?
You want all the tracks to start at the start and not further down the line. At the moment you have one track starting at the point in time the previous track finishes. This is not ideal for CD burning.
@OleHenrik has great advice to take a look at the CD layout function of Adobe Audition. It’s not something I’ve used for a looong time but could look into things further if needed.
I believe what’s happening here is that you’re mixing down stems from the multitrack. Stems will always include silences relative to the other audio tracks. This is so that another producer can slot all your stems into a multitrack and work from where you left off.
You’d be better off mixing down and then Save Selection As or using markers to mark each track or using CD layout to get the trims you need for CD mastering.