in the last few months, we often had our staging repositories split up into multiple repositories. This forced us to repeatedly reupload our release in december, because we could not close/promote those repositories.
We're running into this problem quite frequently, so I did some research and found another issue saying a new staging repository would be created for a new combination of user, IP and groupID.
None of these 3 values are changing, our IP is static (see relevant bugzilla and screenshots) and username / groupID are obviously static as well.
To help investigation of this issue, the screenshotted repositories are still present.