The league standings are automatically updated on the web after the league work is completed for that week.
Please try the following if you happen to run into the error page:
Refresh your browser once you get to the 404 error on the week you are attempting to look at. Occasionally browsers will cache (save) a page so that it will load faster and if you happened to go to the weekly page before it was updated then your browser might have saved that page.
Depending on your machine and/or browser you can usually right click while on that page and hit reload or in the browser bar click on the refresh/reload icon and finally pressing F5 can refresh a browser.