I see the problem, but I have no idea what is causing it. It's most likely a 3rd party plugin or theme issue. Basically some part of the configuration string is html encoded and the plugin script is not able to read it. Something is encoding it, but unfortunately I can't tell yet.
I've tried to log-in with the details give, but I'm getting a redirect loop error: https://i.imgur.com/7n2KEn7.png
Can you please check the login data on an empty browser to see if it's working for you?
Also, I will definitely need temporary FTP acces to find the cause and fix it if possible. This is an unknown issue yet. You can safely add FTP details by editing your initial post in this thread, or by uploading a .txt file with the details. Both methods are safe, visible only for me and you.Best,
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