Hello,
I’m sorry that you’re running into this issue, but I’ll be happy to help you figure out what’s going on. First to clarify, is this happening in the admin area or on the front end submission form?
Issues like this are commonly caused by conflicts with another plugin or (most commonly) a theme. Can you try running through the steps outlined here to test this? Can you also check the page for any Javascript errors by right clicking, clicking “Inspect”, and viewing the console while you try to recreate this issue? If you see any errors, please copy/paste them into your reply.
Thanks,
Jennifer