Performing a search like this:

Only returns one ticket, #478373, when it should return several tickets that are currently overdue. Why isn't this search working?
The same does not work:

It only returns this ticket #478373 with due date of 7-31:

When the built-in Overdue queue (Open > Overdue)

produces an accurate result of at least 4 overdue tickets assigned to me (and me only, for some reason):
