Emails from one of my six AOL accounts not displaying, and instead the emails from one of the other accounts is duplicating.

I use a single Thunderbird password to access my six AOL accounts. Starting yesterday, the emails from one of my six AOL accounts do not display, but instead the emails from one of the other accounts is being duplicated in their place. I know the missing emails are indeed still in existence, since I can access that account's emails when I sign in to AOL in other browsers.