Login confusion

Hello

I have a WordPress install in a folder on my web site.
http://nanandmont.com/attitude/
I have Godaddy redirecting http://teamattitudesports.com/ to my WordPress folder.

They both point to the same web page, as they should. The problem arises when I try to login. If I try to login from this page: http://teamattitudesports.com/ or http://teamattitudesports.com/wp-admin I get an incorrect password screen

If I login on this page http://nanandmont.com/attitude or this page http://nanandmont.com/attitude/wp-admin/ I am able to login

One more comment. I do have another WordPress install on http://nanandmont.com/ Could that be screwing things up?

Any suggestions?

THanks
Monty