Why does permission not stay repaired?

Every time I repair permissions Disk Utility reports the following:
Group differs on “Library/Printers/InstalledPrinters.plist”; should be 80; group is 0.
DU reports it as repaired every time, but then the next time it's the same thing.
Why won't the permission repair "stick"?

Thank you both.
Everything works as expected, but if that is the case why does DU indicate the permissions need to be repaired?
"If it ain't broke, don't fix it."
I realize things permission issues arise from time to time, and over the years there have been occasions when Apple has issued a "list of permission errors which can be safely ignored."
But it's just a minor annoyance.
(Credit for solution to thirdvst due to fewer points.)

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