Cgin found but CIN3 diagnoised

Hi all…
Had a smear May 2021 after i had my son… showed i had HPV so invited for another smear 12 months later… life happened, i put it off and went Aug 2022 which came back with HPV still and cell changes of CGIN.
Had a lletz on Dec 22nd 2022… and results came back with HpV and CIN3 with clear margins… no sign of CGIN changes.
Going for another smear in june… but im so scared they have missed the CGIN cells… like how can they show on a smear but not on a lletz sample?
Has anyone had this happen?