If you have your browser history set to delete on close that will happen. The customisations are stored per browser. Which is annoying. It really needs a system setting.
I agree it is annoying, I did expect it is a system setting.
Maybe someone needs it to be a cookie setting for different browsers / tablets / whatnot. But I would think most expect it to be a user specific setting that is system wide.
When disabling cloud, the netatmo integration started giving an error. It seems to be dependent on cloud, although the description for cloud led me to believe it is only for Home Assistant Cloud. So be careful when disabling these.