Checkbox validation rule not acknowledged after checking the check box

I currently have a form with a validation rule on a check box.

Validation Rule = FieldName !=="Yes"

If the check box is not checked it will highlight in red, but once the check box checked it still stays red and it is not acknowledging that its now checked so it wont allow the submitter to save the form.

Is there something that I need to add besides the validation rule to the check box?