I would re-examine the card that you got back in a 7 closely. Sometimes, and this is just a completely outta of the sky hypothesis w/ absolutely nothing to back it up, but I think the graders now and then may have "doctor's" handwriting, where they might have written a 9 very sloppily, and the second grader may see the grade as a 9 also, but the person who enters the grade into the database, sees that number as a 7. So if there are no defects that you can see, you might try re-submitting the card again.
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