Lightroom CC problems when syncing to local folder: not same final number of items

I have a Lightroom CC with 1Tb cloud storage.
I wanted to have a fresh start and to redownload all my assets from the cloud library, on my local folder.
The synchronization completed, but when I look at the number of items, there are 90,000 in the cloud and only about 60,000 in the local folder.

Yet, the synchronization status stays "finished" and I don’t know how to make Lightroom CC double check again that everything is in place.

How can I properly collect back all my pictures?

This happened on both Mac and Windows.

Thanks