An MVC form might be blocked from submitting if it contains a ReCaptcha field marked as required in the Web Forms for Marketers (WFFM) Form designer. Submit action validation works properly for all the fields except the ReCaptcha field. Though the ReCaptcha is verified, the validation message still shows field is required on submitting.
The issue affects WFFM 8.2.0 and later versions.
To resolve the issue, consider one of the following options: