Lightroom Sync Issues

Hello, a client is sharing photos with me through shared albums in Lightroom CC where I am editing in Lightroom and retouching in Photoshop and saving back to Lightroom.

Things were working fine for the first few days but the last few images across a couple shared albums will now no longr sync. I am unable to star or flag items in shared albums in order to try and refresh the sync and I am unable to remove these photos as well (I'm assuming because I didnt upload the originals). I have also tried uninstalling and reinstalling the software but this hasn't worked either.

I dont really use Lightroom CC so I'm not fully familiar with how syncing works across shared albums. Any suggestions to fix the syncing would be appreciated.