Why do we have two cribs again???

I've been trying to figure out why we still have both the cribs up lately. When we put the boys to bed at night we put them in their own crib, kiss them goodnight, shut the light off and close the door. But every time I go in to check on them now they are always in Kalsin's crib! Apparently it's the most comfortable out of the two! I'm not exactly sure what to think about those two. They fight ALL day long (pushing, hitting each other, stealing the others toy) but at night you would think that they are the best of friends by sleeping in the same bed and sometimes cuddling up with each other. I don't get it! So again I ask... Why do we have two cribs again???