Unfortunately one of the packs had either been mishandled on its way to the store or somewhere in the logistics someone had put too much weight somewhere to cause these weird lines.

Yeah, that's just classic quality control from The Pokemon Center. Factory damage and errors are way more common these days than you'd ever think. From miscut cards, to dented/scratched cards and roller marks, to all kinds of weird errors like upside down backs or holo shifting, they fuck up all the time these days.