Two accounts under one login doesn't work anymore

When I log in to xfinity.com I see two accounts, My moms and mine.  My mom is elderly so I help her with her account.  This was never a problem before, Now I can't see my account most of the time.  If I select my account one of two things happens, the website still shows my mom's account information when the site loads,  her services, etc. or I get stuck in an endless login loop and basically have to kill the browser window.  Seems like this feature (one login for multiple accounts) was never tested.   I've tried in Chrome and MS Edge, its not a browser issue, the website is just buggy.  Please fix or give me a way to create a different login for my account.