Okay mommies my little girls gets diaper rash after diaper rash as soon as one goes away it’s back…

Okay mommies my little girls gets diaper rash after diaper rash as soon as one goes away it’s back again. Why could this be? I love using Luvs because any other diaper doesn’t last through the night and doesn’t hold the scent of pee very well. Rn I am using pampers because that’s what kind we got for my baby shower she’s now in size 4 and 9 1/2 months. I use triple antibiotic ointment for her rash because desitin does not work what so ever neither normal or extra strength