TSA has an issue with food in cabin baggage and this incident is a sign of that and/or of the multiple “metallic”/“reflective” plastic soft packaging causing the cabin baggage image screener to perceive a problem with the bags.

When I transport lots of American food/snacks/candies from the US to abroad, I default to putting them in checked luggage — even when I don’t really need to check in luggage otherwise and could fit the stuff in my cabin baggage allowance. I do this with checked luggage at times so as to reduce the chances of facing a slow down at the TSA passenger/cabin baggage screening checkpoints since I know TSA makes a fuss over foodstuff of various sorts and has issues with metallic and reflective-coated plastic packaging material when there is a lot of it in cabin baggage.