Own hcap solver + register error

Hello everyone,

I have successfully developed my own hCaptcha solver. While I am unable to talk more about how i made it etc, I am encountering an issue. I am attempting to create an account generator, but I receive the following error, even though the email is not yet registered:

https://preview.redd.it/bljavdk4i0pf1.png?width=929&format=png&auto=webp&s=52ce32569eee498b9e30c11bc2eea04d8efb6576

https://preview.redd.it/tf082i74i0pf1.png?width=1007&format=png&auto=webp&s=623454f851950364c007ab29eb5aa60b01d182aa