If you need to officially communicate with Itch, it is best to do so by contacting support.
The forum is normally answered by people from the community and not by Itch staff.
Regarding your question, if you search a little, you will see that there are multiple topics that talk about the same thing.
Each Jam must be reviewed manually and not all are shown on the calendar.
If you think there is an error why your Jam is not showing, it is best to try to contact support.