During the recent update, Dropbox mentioned that there could be a syncing issue for installed Dropbox clients in some Windows servers.
To fix this issue, first, log into the Dropbox account via a browser. You can remove the active devices from this link. Then, log in from your device in the server. It will help your Dropbox sync with the recent and fresh targets.
Dropbox Devices and Security – https://www.dropbox.com/account/security