The home office sends down the prices. The scan coordinators just hang up price tags. They keep their eyes open for mistakes like a can of beans for .10 (it happens) or a bottle of advil for 465.00. I've seen it myself. But, if your talking about a dollar difference here and there perhaps they are not hanging up the correct tags.

Document the items as they scan wrong. UPCs, product name and size- they can't fix it if you say, "kroger beans are priced wrong."

If your ad items aren't ringing up correctly, then your store has issues.