Anh, does this apply to fields hidden via the CSS display: none;?
Recently we've created an update to validate the field if it is visible. If a field is hidden by conditional logic, it will be ignored when running the validation. I'm going to create a request to support this case if the user needs to validate the hidden fields.
This has totally screwed up our data coming through multiple front-end forms and we need an immediate fix. Do I need to revert to an old version or is there a change I can make to the code to revert this temporarily until a fix is released.