+ AA6YQ comments below
I had a LOT of these when I brought old 2001 year satellite qsos in with a sloppy *.adi file.
The grid squares looked "good", but until I went into EDIT and deleted the grid square, and then re-entered it, I would keep getting the error.
+ The QSO's latitude or longitude was invalid or inconsistent with the grid square. Re-entering the grid square corrected the latitude and longitude to match the grid square.
73,
Dave, AA6YQ
