Hi SimonKSP, my name is Ferdinand, I am an Independent Advisor.
Please open up Google Chrome, then click on the 3 dots at the upper right corner then click on Settings,
Under Settings go to Privacy and Security section, click on “Site settings“.
then go to Notifications, then look for Captcha-sourcecenter.com site and click the three vertical dots button, then click on Remove.
Rescan Malwarebytes.