Diaper sizing

Hannah • 20, young mommy to Marlinda and Clarissa, but super happy. Engaged 2-16-17

Who here agrees that diaper sizes are inaccurate weight wise? My daughter weighs 22 lbs and she wears size 6 diapers, which say 35+ lbs. Her 11 lb sister I'm about to switch to size 3, which is what my 22 lb girl is supposed to be wearing based on the chart