Lots and lots of articles written about 23% of 300 items -- at one store? Every store?

What's the actual extent of the problem?

There have been way too many articles and videos at this point to keep pointing at the same small data set.

I've personally never experienced an overcharge, and at 1 in 5, it should have happened by now.

Is this a one store thing, or a regional thing, or should I just put those thoughts on hold and rage blindly?