So is it a 6, a 7, or a 9? Only your TPG knows for sure

[swarmee]

The first PSA holder Cert #241... shows the first generation hologram flip on the front. The second one #248... appears to show it as a PSA 9 without the hologram flip.

Two possible reasons, even if it's the same card:
1) Submitted by a bulk submitter where they may have been using old stock flips (without hologram).
2) The early hologram flip did not always scan properly depending on the scanner setting/angle of the flip. I have seen multiple cases where the scan of a card with the hologram flip did not show the hologram.

These cards were all serial numbered by the manufacturer, kind of like a raffle ticket. So it is highly unlikely they would have duplicated serial numbers.