Just to inform you that the solution written above has no effect.
The Chaptcha does not disappear and therefore the problem remains. 1) after entering email the user does not see the Chaptcha 2) if he approves the Chaptcha he does not see the message that warns of the registration (none yet near the area where the message appears). 3) most customers believe they are registered but they are not. We think this is a very important point to resolve. Best