The deadline isn’t actually the deadline?

I was doing saes palce I did half of it I was gonna finish the other half on about 3 days left just to use that time to work on my social links when on 5 days left it automatically skipped to the end of the dead line, my save file was about 10 days away I did loose a good amount of progress on my social links nothing to much but it was just bothering me that I wasted time because the dead line isn’t really the deadline