Thanks for the additional information and sorry to hear this persists Jef.
At this point, as I'll need account specific information to help troubleshoot this issue, may I reach out to your Dropbox associated email address so we can have a further look into this matter?
In addition, have you checked if your device is showing 'hidden files'? If that's the case here, to avoid seeing hidden files:
- Open the Terminal app and click Applications, Utilities, and then Terminal
- Copy and paste the following line into the Terminal app, and then press Enter:
defaults write com.apple.finder AppleShowAllFiles NO
In any case, I'll be waiting for your response so we investigate further!