dual directories?!?

bit of a question, i have the new WP version of the site working now:
http://oceanboom.com/
but when i was moving files around and trying to figure out how to get things working, i purposely copied all the wordpress files into my root directory as well as the
http://oceanboom.com/OCB/
directory. i noticed that i can log into the admin page at both
http://oceanboom.com/wp-admin/
and at
http://oceanboom.com/OCB/wp-admin/

first i logged in here http://oceanboom.com/wp-admin/ added a post. then i tried logging into the http://oceanboom.com/OCB/wp-admin/ and i could see the new post just fine.

so my question is
1) what does this mean? i think it means that i can use my mysql database in either directory…
2) is this bad?
3) should i delete the root directory stuff? i just want the WP stuff to stay in the OCB directory anyway…