Dog cage! Help

Well my two puppies made some poo and pee in their cage while I was at work and I went outside to clean it with my hose and I left it outside to dry. I bring it in and its all bent...I tried fixing it junping on it and it won't go back flat...is it because I left it out. ? I don't understand its like when I put water in there its lopsided....please help I don't know how t lo fix it !!! I got the cage from Wal-Mart with those bottom frames that come out.