Anything come to mind as to why a behavior functions as expected in Preview but not during actual use?
I have a behavior set to unhide items when a checkbox is checked, using a simple branch to hide if unchecked and vice versa. During Preview, it works wonderfully but after publishing the form, users report that the hidden items do not appear. This is confirmed by viewing the form via the notification link sent via email.
Please submit a support inquiry form and attach a copy of your form design: /help-center/support-inquiry/ . Please describe in detail which items and checkboxes are having problems. I will review your design for you. Our help guide describes how to export your form design: /Documentation/manual/html/?d_exportingformsandformdata.htm