reCaptcha plugin uninstalled but Captcha box still there

I have recently installed this plugin to add Captcha to my registration and account page.

However, I encountered an issue where the box states ERROR for site owner: Invalid site key

I tried countless different ways to attempt to fix it by clearing cache, reinstalling the plugin, creating new reCAPTCHA keys etc to no avail.

I decided to just uninstall the plugin. Now, I am facing a new issue whereby the captcha box is still there with the same error!

I tried to restore my site to a week old backup, to no avail.

I even restored the database, files and everything, even losing my customer data within the past week just to try and fix this issue but all to no avail and all for naught…