Help modify redirect link button registration

Hi guys!! I am working in Community builder and I am freaking out on a point:
I use CB Registration Form to duplicate registration. I use the two privs registered and author to register two types of users, Students and Companies. With this plugin I can show only some selected fields analyzing the usertype.

All works, but i have found this bug:
If someone do some error in the registration (example invalid email), the "Register" button sends me in:
/index.php?option=com_comprofiler&lang=it
I have to find where is built in comprofiler this link and modify it. Do you know where i can find it?

Sorry, I am not familiar with this plugin.

I am not looking for something inside the plugin itself, I am looking for where in community builder is built the redirect link if the registration fails (example wrong email).