I tried to log in and now it says my password is incorrect, I have a feeling that someone may have deleted my account. I don't know what I have done to deserve this as I obey all the rules set out on the site.

Does this mean I will lose my rank?

no, it just means you can't log in at the moment. this thing keeps on happening to me and i just go and rest for awhile then i go back online and fight. :)