Unable to login to WordPress site

Hello,

I have been unable to login to my wordpress website for some time now.
This is the website: http://upsidedownworld.org/blog/
And this is the login page: http://upsidedownworld.org/blog/

I have tried numerous times to have wordpress send me a new password when clicking the “Lost your password?” link. A new password is sent to me, and when I type it in, the page refreshes and the entry boxes go blank; this occurs each time, so I can’t get into my site.

Does anyone know why this is happening or how to fix it?

Thank you for your time.