Plugin serving changed URLs to users

This just started happening recently:

The URL of my home page should be:
http://www.mydomain.com/

But this plugin is serving this URL to users:
http://www.mydomain.com/wp-content/cache/supercache/www.mydomain.com/index.html

I was first using Legacy page caching.

Then I tried: Use mod_rewrite to serve cache files. (Recommended)

Now I will try: Use PHP to serve cache files.

Is there a setting somewhere to disable serving these redirect URLs and instead serve the expected URL?

Thank you in advance!

https://wordpress.org/plugins/wp-super-cache/