Why Have Some of My Releases Disappeared From My Release List?

The chances are, these releases have not disappeared they are merely hidden from view.

Your release list will likely have a filter applied to it and for example, is just showing Unreleased releases.

To view all releases, simply change the drop-down menu at the top to All which will display all of your releases.

Other filters include Status which can be set to Draft, Final or Deleted.