CoursePress courses page doesn't work properly upon changing https to http

I changed the siteurl and home values from https to http for a site in my multisite and suddenly the /courses page and anything that works from that slug on the front end doesn't work any longer.

You can see this in action by going to

http://church.grapevine.education/courses

To achieve that, I just changed the siteurl and home options using the site settings at the network level, changing from

https://church.grapevine.education/courses

to

http://church.grapevine.education/courses

Changing back to https doesn't seem to fix the issue.

Any idea how I can recover that page and get it to start working again? I will enable the support access option in case you need to take a look.