Hello,
Thanks for the feedback!
It looks like what you see is the “Honeypot” field. This spam prevention setting is a feature first implemented by ACF within ACF Form, which has been ported to ACF Extended Form since the initial release, years ago.
This setting adds a hidden text input that should stay empty. Bots and autocompleters might get trapped and try to fill it. In that case, the form validation will throw an error. See settings cheatsheet.
The field use an inline css rule: display:none !important, in the <div class="acf-field ..."> so it should not be visible. However, I see some custom css styles on your page, so I would recommend to check that it is correctly applied.
Additionally, I see a <div data-lastpass ...> inside the field, which should not be here. It is probably added by your password manager application, as a browser plugin. This application might force to display the field.
In all case, you can always disable the setting in the PHP code or the Form UI. However, I would recommend to add some spam prevention check, such as a reCaptcha Field for example.
Hope it helps!
Have a nice day!
Regards.
