Reply To: Error on social login

Something on your website breaks PHP super global $_SERVER array and overrides the value of REQUEST_URI key in that array. This variable contains URI parameters. For example on the page https://website.com/page/id/some/other it will contain /page/id/some/other but it doesn’t work in this way on your website. Check the screenshot https://gyazo.com/f10575a21c864c3315bcd996647d57e3 as you can see, it misses the /en/ part.
It may be due to some plugins or problem with your server.