Ckappes

Hello I’m trying to book our first cruise with our kids on royal Caribbean with the kids sail free. I noticed when I just enter me and my wife our cruise fair is $356 each, but when I add in our two young children their fee is $286 which does get subtracted with the kids sail free deal, but mine and my wife’s cruise fair goes up to $616 each. So really we actually aren’t saving any money. Am I doing something wrong here?