Can I correct the start date of my Ed visa extension after it was set to begin on January 31 instead of February 24, 2024?

I have an Ed visa from university which was Supposed to expire on 24 February 2024, I went to immigration to extend 2 days ago which was 20 odd days early, the immigration officer started the new extension from 31 January which cause me to lose a month. In my previous experiences I have always done my extensions early and the immigration officers started the new extensions from the date of previous extensions expiry. Just want to know if maybe the officer made a mistake that day and I should go back to correct?Or should should I accept the month shortage?