How can I delete the captcha field?

Good day, everyone! 

I accidentally clicked a few times on CAPTCHA button. As a result, now I have three captchas. I don't need them, but I can't delete them either. I don't know what to do?

While editing the form, it shows the text like "Unexpected error occured control_captcha". And I have THREE of them. How could I delete them?

Thanks in advance.

You should be able to delete the extra captcha fields by clicking the field > then the red TRASH BIN icon.