The ribs didn't have much liquid so no issue there. When doing ribs i tend to hit the seal button before it would automatically because i find the bones are sharp enough to pierce the plastic if allowed to suck hard enough.
The chickens were well rested and cooled to the point that the liquid had started to solidify. Don't be afraid to seal it early if most of the air is out and it is just drawing liquid. Home vac sealers can't really draw enough of a vacuum to make it oxygen free as it is. But it's better than plastic wrap or a plastic bag by orders of magnitude.
