Incorrectly resolved DXCC are often subject of a discussion.
Problems are mostly with a call from US posessions (AH0U, KH2D,
KP4Q etc. They ae very easy to solve - just press F11 and the
entry correctly changes to USA, California. Also you will see
the County field filled with CA, Contra Costa. This works with
Callbook support defined, pointing to HamQTH.com which is
connected to the FCC database and should be always actual.
I highly recommend to check any call from US posessions with F11!