A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
First of all, Excel treats this DATA as text & its not NUMERIC to get sorted.
Figure shows as if its already in MANUAL sorted order.
Provide some sample data so that we can give some workaround & also weeks in random way.
Suggestion:
Use week starting date in A column
Week ending date in B column
And then apply filter & sort it, so that the corresponding row also gets sorted.
After sort if you want both Starting & ending week to be in same cell.
Then use Concatenate formula