This is because at the time, the top salary point on the 2008 contract was £296 more than the 2021 contract (as at the end of March 2022).
Mae hyn oherwydd mai, ar y pryd, y pwynt cyflog uchaf ar Gontract 2008 oedd £296 yn fwy na Chontract 2021 (ar ddiwedd mis Mawrth 2022).