Hi @toje
I tried to login on your site, but user registration is disabled (admin sidebar -> settings -> general -> membership), so I was not able to. If this is intentional, you do not have to do anything, I just wanted to note this, as new visitors on your site won’t be able to sign up either. We have our own membership option too on the General tab:
https://nextendweb.com/nextend-social-login-docs/global-settings/
if you want to allow the registration with the social login only.
Either way, this is probably not related to Nextend Social Login, as we do not display the Terms & Conditions outside of our register flow. So presumably it is a 3rd party plugin, or maybe theme or custom code that does it (It appears it might be coming from the theme itself, so first take a look at its settings). If you cannot seem to find out what does it exactly, you could make a backup of your website, and disable your theme/plugins one by one until it disappears, and like that you can find out what adds that there.