I should add, I found the problem occurs if I try to redirect any specific https page to http.
For example, if I replace all instances of /financials-bookstore/ with /about/ in the htaccess code, https://www.sbfi.org/about/ will redirect to the root at https://www.sbfi.org/.
So, it appears to be a general problem not specific to the /financials-bookstore/ page.
Deactivating plugins was something already tried that I forgot to include in the list.
Switching to the default theme solved the problem, which is wild because I didn’t expect the theme to affect the admin output as well. I now know to troubleshoot my custom theme.
Thanks!
