I have a very peculular issue that just started happening. I have setup SCLogin on my site and it worked flawlessly until I updated to Joomla 3.8.0. Now when I login using it, it wants to redirect to a different site. While the site it is trying to link to is in fact one I own I do not understand why it would be doing this? For one thing it is trying to link to it by way of FTP and I never even used this site at all during development so I am at a total loss why this is happening or how to fix it?
Here is the site in question and if you click the login go ahead and enter the user and pass I created to see what I am talking about.
I cannot reproduce that behavior on your site. Logging in with those credentials (using Chrome), I am not redirected off of your page. It brings me to https://www.abaconnection.com/my-courses/orders and logs me in properly. Can you try a different browser? Clear cache and cookies?