[Solved] Error: You entered an incorrect CAPTCHA answer

Hi - I'm having an error where guest commenters (i.e., not logged in) are receiving an error message ("Error: You entered an incorrect CAPTCHA answer. Please go back and try again.") when they try to post a comment. I have

• disabled "Show for Guests" and "Show for Logged in Users" under WPDISCUZ > Forms
• Invisible Spam Protection turned on
• tried switching CAPTCHA generation type from WP Session to File System
• cleared both my browser and server cache
• tried deactivating all other plugins to see if there was a conflict
• tried switching to the Twenty Nineteen theme to see if there was a theme conflict (we're using Extra by Elegant Themes)

I'm seeing the same issue regardless of what I've tried. Also, I do not have any other CAPTCHA plugins installed that might be creating a conflict.

Here's a screenshot of the error message I'm receiving when trying to post a comment as a guest

The latest version of the plugin is installed.

Everything worked perfectly when I first installed the plugin; I haven't tested since so I'm not sure when, exactly, this issue began.

I'm now totally stumped as to what might be going on. Any insights you can share would be greatly appreciated 🙂

Here's a link to a post you can look at in case you want to test yourself: https://csclassics.com/instructions-to-a-student/

Thanks in advance for your help!