I'm not basing it on dates but weeks rather. The reason why the formula fails is because it ranks teams from 1-18 rather than 1-20 when there is A PPD fixture (excluding teams that didn't play from the rankings basically). if two matches are PPD then teams will be ranked 1 to 16.

'base them on scheduled weeks instead, e.g. as number like 202401. When the game was postponed, it will not accounted until it is really played. And then it will be accounted for scheduled week, not for week it was really played at.'

Would you elaborate more, please?