When you click the “Register” button, the captcha should NOT appear. If you receive an error that you have not passed the captcha verification, it means that Google reCaptcha considers your actions to be template and fast - as if they were done by a robot. Try refreshing the page, making everything slower. If this does not help, check and disable ad blockers and all variants of “privacy enhancers” - perhaps because of them Google reCaptcha does not have data about your actions and therefore it believes that you are a robot.