The exceptions in food labeling confound me. I keep assuming that some behaviors have to be illegal, but Federal rulemaking changes have been spottily reported

The exceptions in food labeling confound me. I keep assuming that some behaviors have to be illegal, but Federal rulemaking changes have been spottily reported for over 20 years. One example is nuts. There are off brands (I see mainly among Grocery Outlet and store brands) which will say things like "may contain nuts from (list of 8 countries)". How can that be legal? When there is any recall, how could any of these not need recalling? etc. Plus, obvious errors go unresolved. For example, the Hoodys peanuts in shell at Costco. The nutritional information assumes ~10% shell content by weight, but the number of servings times serving size = 110+% of the item weight. Math just ain't that hard. I actually reported this to Costco over a year ago; it remains unchanged.