Someone probably tried to log in as you and pressed the link for a forgotten password. If you share the admin function and the password, only you will be able to reset the password as the link goes to the person registered as the admin.
Maybe one of your members is accidentally pressing the Admin Login button instead of the member login button
If you do share the password (multiple admins), it might be worth changing your settings and granting access to relevant features to officers who need that - they can then use their member login to access those features. The documentation for using access settings is here:
support.toastmastersclubs.org/doc/item/access-settings