Hi Dan,
That is a bad break. Sorry to hear this has happened to you. I generally always use a minimum grade when using the cross over service because grading is subjective at best. I really do not like using a cross over service as I like the cards I submit to be assessed in their raw state so they get a fresh look.
Absent seeing scans of the cards which got downgraded it would be impossible for any of us to draw any conclusions as to SGC's determination.
Best of luck on getting this resolved.
Greg
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