I had this happen several times to my albums. And when that happened the disappears on all there Macs at the same time.
This error occurred, when I enabled iCloud Photo Library on an iOS device, that has not been using iCloud Photo Library but has previously been synced with iTunes (my iPad 3 with iOS 9, or my iPhone with iOS 10 or iOS 11).
Did you enable iCloud Photo Library on an iPhone or iPad,, after you created the albums?
To restore your albums, you could restore the Photos Library from your TimeMachine backup. if you made a backup, after you created the albums. But restoring the library from a backup will result in a new upload of the complete library to iCloud. It may take a very long time for a large library.
Alternately, you can try to restore the albums, by typing the name of one of the albums into the search field. Photos will probably remember the album and show all photos from that album. Then select all photos and use the command "File > New Album from selection". Do you remember the names of your albums?