Seems to happen a lot when squishing with a hair straightener. The plates slide laterally when ya try to squish with any real pressure. Opens up the pouch 99% of the time.Try pre-pressing the bag/bud cold to make it flatter first. I have a 20 ton press and almost never have a blowout...although, it has happened. I like the raw parchment better. It seems to be easier to collect the goodness. Hope that helps.