First, double-check that there aren't two Joplin folders on Dropbox (e.g. Joplin (1) and Joplin). If there are, it's possible some devices are syncing to one folder and others to another.
If that's not the case see other common sync issues.
First, double-check that there aren't two Joplin folders on Dropbox (e.g. Joplin (1) and Joplin). If there are, it's possible some devices are syncing to one folder and others to another.
If that's not the case see other common sync issues.