escape artist

Hi I have an urgent issue! I set up my new C&C cage today for my skinny pigs and my smallest one has jumped out twice within the past hour! I was told piggies don’t jump high and the cage would be safe, what should I do until the cover I ordered comes in?

just a fun story i thought i'd share about my newly discovered ninja of a guinea pig... my boy oswald is very outgoing and determined so his attitude is not surprising, but his sudden agility is. just yesterday, i noticed he was shoving his face through the bars of his cage and pushing the side...