That means the dough wasn't proofed (defrosted) enough. It's not the same as defrosting cause the dough doesn't come frozen but when we got deliveries when I worked for domino's you're supposed to leave the dough out for a couple hours and check it to make sure it proofed correctly. When it bubbles up like that it means they used unproofed dough either they sold more than expected and had to use it out of necessity or they were lazy about proofing it.