Trouble with a PHP form - Need immediate fix please

Hi- We have a form that has four radio buttons and depending on which radio button you select, certain form fields show up. The form submits on all of the radio buttons except one of them. I need someone to figure out why the form won't submit. I'm sure it's an issue with required information but I am not good enough with code to look through and figure it out. I would think it's an easy fix for experienced coders. I posted the project as fixed price but if you prefer hourly let me know. If you look at my ratings I have always been fair with payment. Please don't bid if you can't work on it right now. Thanks.