I have a content download form that appears to be allowing submissions with no email address or other visible field values, despite the fact that fields like the email address are required. The form is shared across multiple landing pages, but is currently only being used for one, for a paid search campaign in AdWords. The form is capturing hidden field values like UTM parameters correctly, but the visible fields are not getting posted to the new lead/person in Marketo. When I test the LP/form, it seems to be working correctly.
I did not build the form - I inherited it from a previous Marketo admin - but I did add some hidden fields a few weeks ago, and that is when the problem seems to have started.
Any suggestions on the steps to troubleshoot and fix this issue? I'm a little stumped at the moment.