Here is a link to the form:
If you fill in the "Week Ending" field by using that pop up calendar, all of the remaining dates for the week do autofill.
Except when the "week ending" date takes place within a week that is not entirely inside of one month. So, like today, it is the first of May on a Thursday. And so the tuesday field will fill, but none of the others.
Here is the code behind the Wednesday autofill field.