Mixdown contains variances in track alignment

Cubasis 3: Another Issue with 3 tracks fully aligned during recording/punch-ins, and then wavering in and out of alignment during the song in mixdown track.
Particulars:

  1. 3 tracks, Wave reverb, compression plug-ins,
  2. mixdown settings - I have varied latency settings with no changes in this issue.

Just realized the protocol for bug fixing, and will fill out/send form soon.