Your Tonido local data is not removed when you uninstall Tonido unless you select an option during uninstall.
Make sure that Tonido is not running when you reinstall Tonido.
Exit Tonido before starting the installer.
Uninstalling Tonido and Deleting Account
Tonido installer should be used to uninstall Tonido. Please use that to uninstall and select the option to delete all local Tonido data (Which will delete your account as well).