Register Page Breaking Theme on Signup

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

First I go to or
click on register, register send me to my main site
fill all the info, when I click on complete sign up
I get this
This is how the page looks before I hit register
This is not the only theme here is another theme

I am using WP 3.6 Only BuddyPress activated

If I deactivate buddypress I can not register and redirect automatically to

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