ww.wp.xz.cn login vs wordpress.com login

Hi,

I am trying to figure out why my ww.wp.xz.cn blog account and my ww.wp.xz.cn username don’t work on wordpress.com. I know that the 2 sites are different. However, according to wordpress.com my username is already taken (it’s the same as my login here), but it does not recognize my blog login password or my ww.wp.xz.cn password. When I tried to use account recovery on wordpress.com (again, my account works fine here and on my blog), I get in a vicious circle: wordpress.com won’t let me register because my username and email are already taken, but it also says that my username and the 2 emails I used to create my other accounts are not recognized.