required fields missing

We have a form embedded here uisng the iframe method

3 out of 600 submissions are missing a required field.

Can you tell us how this might have occurred?

I see here that iframe-ing to prevent javascript conflicts is recommended, but we're doing that.

http://www.jotform.com/answers/142971-Can-submit-form-with-required-fields-missing

Anything else we should try?

It actually depends upon the situation since there are actually 2 major reasons this can happen. One it could be a conflict with the website your form is embeddded. Or Two, It could also the possibility of someone using your form via an outdated browser or even with their browser javascript disabled. Either of those would cause it since the " Requirement " feature relies on javascript to function properly. 

Anyhow, I started going through the first couple pages of your submissions and I'm not seeing anything out of the ordinary yet other then 3 fields but those 3 fields (Further Information, Company Name, and Alternative Phone Number) I can see are not marked as required on your form if that's what you might have been referring to maybe.

If not then can you please provide us with an example and we'll look for it once we have more information?