Convert Mac OS Extended (Journaled) Time Machine contents to APFS
If clicking the date doesn't move to that date, it's because there is no backup for that selected location. It doesn't mean there's no backup at all.
See this image…

I have backups only for my boot drive. Other drives have been removed from Time Machine's backup prefs. If I start from 'Now' then all the drives show in the list on the left. As soon as I scroll back, then the other drives grey out, because there's no data [Acronis is an NTFS volume &amp; Time Machine doesn't know what to do with that].
So, to see what's really there, start from your boot volume &amp; go backwards from there. At each step some locations may grey out, but the boot drive itself should have data going back in time.