+ AA6YQ comments below
FWIW, there is an issue with the current version of SpotCollector when the grid for a spot [database entry] is derived from the DXCC database entry matching the station's callsign. In such cases, the spot database entry is not supposed to be marked as needed, even if you do need that grid, since the source of the grid data is not sufficiently precise. There should be a fix in the next version of SpotCollector to handle this properly. For me, this issue was most noticeable with VE stations, where the grid would be one in the middle of the VE province, most of which are in the middle of nowhere, hence needed.
+ The next version of SpotCollector, which includes the repair of this defect, is now being tested by two users.