Unable to submit PDF form

I am currently running an online course and the students are to fill in the PDF and hit submit and I have it linked to my email. However, when the students are hitting "submit", I am not receiving their submissions and it is causing delays with my program. How can I solve this?

I just downloaded your "Event Feedback Form" as a fillable PDF form: https://www.jotform.com/help/212-How-to-create-a-PDF-form 

And used Adobe Acrobat Reader to open the PDF, then I filled and submitted it:

What program are you using?