Sorry that your images are showing up as missing in Lightroom CC but they are available on Lightroom web.
Just confirming, are you using Lightroom Classic CC or Lightroom CC on your computer?
If using Lightroom Classic CC, please head over to the Preferences> Lightroom sync menu and hold down the "Alt" key, you should see an option "Rebuild sync data". Select this option and let Lightroom rebuild the synced data.
This will show actual sync errors or missing files if any. Let us know how it goes.
Ok i will try that.
is this a harmless thing to do? I have so many edits and tagging I'd hate to mess up my catalog.
That worked. It only took a few seconds.
I rebuilt the sync data, lightroom restarted and the 11 are still there. What now?
This is not fixed.