Primary acct. and sub accts.

I have five emails,one primary {edited for privacy} and four others.

Until today I had no problem, the first four would show and I would pick the one I wanted to open.Today since {edited for privacy}  did not show I put it in for a sign in.Now I can not remove it and it keeps opening automatically on to it. Why does this  now figures as my primary and {edited for privacy} as a sub on my acct. information.