Register Page Breaking Theme on Signup

Hello
I am having a little trouble with one of my sub domain theme

First I go to http://clasificados.redboricua.com or http://agenda.redboricua.com
click on register, register send me to my main site http://redboricua.com
fill all the info, when I click on complete sign up
I get this
http://awesomescreenshot.com/08c1qav06b
This is how the page looks before I hit register
http://awesomescreenshot.com/0a01qauje1
This is not the only theme here is another theme
http://awesomescreenshot.com/0ad1qav9c8

I am using WP 3.6 Only BuddyPress activated

If I deactivate buddypress I can not register and redirect automatically to http://clasificados.redboricua.com.

If you can register in clasificados hopefully it will reproduce the problem above.