The “remember me” functionality requires persistent cookies in your browser. If your browser is not remembering that you checked the "remember me" box, then check the cookie settings of your browser. To find information on the cookie settings of your browser, click the following link to search:
browser cookie settings.
Chrome's "incognito" setting, Firefox's "private window", and Internet Explorer and Edge's "InPrivate" settings will affect this behavior and the "remember me" feature will not work.