Password Protected Page not working

I am having an issue with the default password protect page feature on this page: https://constantbranch.org/news/

It is working properly on another page on this site, just not the one above. I have attempted to trouble-shoot this issue, and it seems to be usually a conflict with a plugin. In my case, there are no advanced plugins (except for Akismet).

Any ideas on what might be the issue here?

Thanks!