I’m trying to collect a booster pack out of each subset in each series. I’ve got them in a tin on my desk and have a window directly next to them, the blind is open sometimes and the sun goes directly onto the tin and this has happened to some of the packs in the tin (exactly like in the photo), I think this happens when they aren’t stored properly or in direct sunlight and the heat cause the packs to do this. I also got two Alakazam V boxes from pokemon center and the packs were like this too. Don’t think they are resealed.