It’s also possible they used smoothbore / 16D nails & not ring shanks.
If your ridge vent was a GAF Cobra III, it will come with the nails sorta built in (snapped into it). A LOT of nails… like 3x the amount you really need. There are a lot of other brands that incorporate the right nail into the vent.
Give us a photo from the top if you can safely get up there. I.E. looking DOWN @ the top of an exposed nail.
Then, go in the attic & measure how large a slot they cut (from center down the slope). If it’s someone who didn’t know what they were doing, the slot may be too wide.
Finally, was it a “real” roofer or a carpenter? Maybe a handyman? Believe it or not, that’s an important question.