some of your form elements have invalid names. for example:
<select class="formMenufield_Large" name="SECTION_B_CULTURAL_BACKGROUND_group_Do_you_require_support_from_Guru_training_with_language,_literacy,_numeracy_and_or_guidance_services"
form names can contain only letters and numbers. The only exception is the underscore character. this form element has a coma in the name.
CSS Form builder creates the name based on the label you give it, you should avoid using special characters or punctuation when crating a form element label.