a little more information might be helpful.
Type of footage (red can have multiple timecodes inside some programs)
Was the footage linked, transcoded, relinked to original and now the match frames aren’t working?
Is there duplicate file names/locations that could be buggering things up?
are all the clips in the multigroup showing wrong timecode..or just one of them?
(if so, what is different from a technical standpoint about that clip?)
If you reveal source file in Avid, does it point to the correct file?
If you isolate that file, into an AvidMediaFiles/mxf/2 folder, and bring in the database, does it show incorrect timecode?
Is there anyway the timecode is correct, but the original links were screwed with and that was the incorrect timecode?
How were the multigroups created? Auto sync, inpoint?
Glenn