what size am i? got different results across different sites.

(AFAB)

was measuring my chest size for the first time. i got 75 cm under the bust and 84 cm across the bust, this apparently makes me smaller than an A cup.

i redid my measurements and this is my "a bra that fits" bra calculator result

every other online calculator gives me AA.

what size am i??

edit: the link doesn't work and i cant seem to upload a picture so heres all my measurements (in cm):

loose underbust: 76 cm snug underbust: 76 cm tight underbust: 73 cm standing bust: 80 cm leaning bust: 88 cm lying bust: 86 cm

according to the UK system i am a 30 C/D.