After building lighting and reopening multiple levels through the level window.... it says 1300 objects need lighting rebuilt

After building lighting and reopening multiple levels through the level window… it says 1300 objects need lighting rebuilt. Why? I saved directly after lighting build… closed unreal… reopened the level and loaded all the sublevels in… and it says i need to rebuild lighting for around 1300 objects. Any ideas why?

The main level (not any sub level) has the volume objects for precomputed static visibility and lighting and post processing volumes.