Use social login, return URL not working?

I'm using this pugin - which is great, alongside "http://www.oneall.com/services/single-sign-on/" to enable social logins.

When a user logs into our site, they get directed to an odd page. Like this for example - please do try: http://gf.peterbotting.co.uk/questions/open-up-competition

Could anyone help with that? Or suggest an alternative plugin?

Thanks!