I need an operator or person in charge to explain why my login no longer works.

I get in here via my Email, clicking on a comment from a response.
Should I simply not bother login in and just continue my conversations and responses? I am not blocked. I can still responde to questions and give my responses.
I know my nic, email, and password.
I have even tried to reboot my computer. When I get in S.W. I am asked by your computer to log in. I'm in! And I am told to leave and login. Does anyone else share this experience?
I need a moderator to advise.