Some questions back to you:
Was the project you are in started in a different project format> For example, NTSC 23.976 and now 1080p/3.976? There has been a long standing bug that if you flip project format, the ALE will not import. Only in the format of the original project creation.
As far as the timecode drift, that is quite strange. Try entering the same sync (punch) timecode into one of the AuxTC columns and see if that tracks properly. And of so, how does that compare to the START?
Lastly, I would need a sample file and ALE to really get down to the bottom of the issue.
Michael
Michael Phillips