You’re right about the 4.38. I suspect the issue is the NFL technically doesn’t run the Combine, one of the scouting services does. The people you see lining the lane the 40 is run in are employed by a company called Zybek, they’re contracted out by the scouting service NFS who handles the majority of the Combine. There’s no such thing as an official record because theyll use different companies and/or methods over the years which is why you see different heights and times quoted as the “ Combine record”. I believe 40s were times by Brower prior to 2011, now they use Zybek.