I use a self-made sub-theme for longer time. It’s working ok. Today I started a new multi-sited site and assigned this sub-theme to it.

What is strange the mention sub-theme is shown as having an update ready. I know the parent-theme has the updated version but here only my sub-theme is marked as ready for update.

Could be it’s the process related as I marked it as site theme before the original theme was used on the fresh site/database.

Could be it is marked as original,somehow. Any way, I would like to stop it messing my maintenance messages.

PS. Changing themes change nothing now. One it’s marked for use it’s marked as update ready. But only on the newest site. Older sites shown version as expected.