Coding engines sometimes you need to pass simple protections, one - i recently seen is simple, form is adding data that normally is not visible, and SER is not adding it by default.
So after filling registration info in SER i was redirected to homepage, strange...
What i used to see what is really happening is chrome request maker extension
I filled the form data, submitted the form and here we go, theres variable that i couldnt see in SER log.
add fixed data=form-loaded=1