All applicable titles in my list not showing up on the airing calendar

There are usually a handful of titles that do not appear in my list under the airing calendar, even though the titles are in my watch list.  It happens across all countries and is not specific to any set title format (drama, movie, special, etc.).  Any assistance or feedback would be greatly appreciated.  Apologies if this has been documented already and is being worked out.  Thank you for all your hard work.