That stories disappear, can have several reasons.
Please check your filter settings in a first step.
If you still can not find the story despite the correct settings, it may be that it should be published on a publication platform to which you have no access. It means that:
1. You are either not a member of the group that has access to the platform or
2. Your group does not have access to the platform.
In this case, please contact an admin to give you or your group the necessary access rights.
Maybe the story was deleted? Occasionally stories may be discarded or accidentally deleted. Keep in mind that you will only be informed about this if you have activated this in your personal settings under "Notifications".
It may also be that the publication platform on which the story should be published has been deleted. In this case, the stories of the affected platform are not deleted, but they have lost their anchor, so are no longer displayed.
Unless they were assigned to another platform or to the group as an event.
An important note to conclude: through the "search function", which you find in the top right, all stories can be found again. You can also find and reactivate deleted entries up to 14 days after their deletion.