Register redirect and "invalid user/password" on registration

On the staging site, there are only two plugins active/tested against

– userswp
– s2member framework

while S2 is deactivated, the redirect happens as desired
(here is a register link http://perfectpaddles.com/pp_staging/?page_id=1746 )

After activating S2, the redirect takes the user to the home page 🙁

Currently, S2 is deactivated on the staging site

Thank you Patrik!