When a front end user is completing a form, they have to tab/click out of a field they are completing to enable rules to kick in. For example a lot of my forms have their fields 'initial state' set to hidden, so only 1 filed is present at a time, but to have the next field appear an agent would need to click out of it or Tab to allow the rule to 'kick-in'.
We've come across examples of agents pressing enter which allows the submission of the form, even with subsequent filed to complete which will ultimately lead to a high level of exceptions if this can not be rectified.