Clean Registration page after successful Registration

Hi,

After a Registration is completed on the website http://81.88.24.66/bmw
It stays on the Registration page, clears the form and logs in the new user (although the parameter &step=choose_membership is there).
I was hoping to get it to go to the page for choosing memberships but can't. Tried all possible combinations on the Settings area but nothing worked...

At first I was trying to create my own membership page and only use shortcodes for the buttons, but that's even more complicated, so for now could you please have a quick look to see if you know what might be going on with the flow? After that I'll post about the custom page if still having problems.

I have provided details before for when the website was at 85.139.91.106/bmw they are the same now.

Many Thanks