FCP to STP back to FCP now video out of sync

I exported from FCP to STP via multitrack, did my audio edits, then exported back to FCP via xml import. Three video clips in FCP are now out of sequence (they are completely different, like they have different I/O points. These clips are only 1 second long .
Any ideas on why?

I hate when someone doesn't first search threads for answers before posting. That would be ME late last night. After searching, I don't find definitive answers to my issues.
I am using DV NSTC 48Khz preset in FCP.
The FCP Easy setup: Format NTSC, Rate (all rates)
In STP, Preferences, synchronization, frame rate is 30 non-drop. Is this correct?
What is 30/29.97/Drop Frame?
Could this cause my video clips to come back to FCP out of sync and have the wrong I/O points.
I would really like to use STP instead of just doing the sound in FCP.

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