Monk Weight Allowance

[Yaolin]

I seemed to be able to carry up to 18.9 stones at lvl 53 before suffering any AC reduction. The latest patch notes saying anything about the allowance are from almost two years ago and state the weight allowance does not go up until lvl 55. Is the AC inventory calc broken.... was there a patch changing when the allowance would increase that I missed..... is something else happening? Anyone with an answer feel free to chime in. At lvl 54 I'm still only able to carry 18.9 before losing AC.