I saw the same thing and finally was able to find that it was a “bug” but a “bug” in one .stignore file on one computer (i.e. my fault). If all the stignores are identical, the sync status turns green.
During the process, I got the impression that sometimes it’s possible to have a situation where one computer can think it’s sharing (or supposed to share) one of the folders with another computer, but it actually isn’t, leading to it displaying only X% synced. I haven’t done a systematic study of how to reproduce this, however, but it’s something to maybe consider (loose evidence at this point).