Certain works orders don't display on the order planner, when the planners uses certain filters.
When you click the button in the order planner (with the 6 different colour dots and blue border and down pointing chevron arrow), please complete the following steps:-
Select sort data grid
Sort by priority, then deadline date, then order code.
You may also edit the offending filters by clicking the word Edit adjacent to the filter drop down list. For example, add status not equal to firm, to only show released orders on the order planner.