Workbook assignments with due dates that have passed have disappeared? How can I get these back?

eNovativePiano organizes Workbook assignments by due date, with pinned assignments at the top followed by upcoming dates appearing in chronological order with an orange banner. When a due date passes, that date rotates to the bottom of the list, but in reverse chronological order so users can see the most recently passed dates without excessive scrolling. The banner is now red.

View Tutorial: Section IV. Teaching with eNovativePiano
     Understanding the Workbook Calendar