I recently participated in my first game jam (OST Comp Jam #7). The submission form for the jam was a bit lengthy, and I was going back and forth between different browser tabs and applications on my computer to reference information. I clicked outside the submission form modal pop-up box and it closed the form altogether and I had to start over completely. This happened twice while I was filling out the form.
This was quite frustrating, but I was able to complete the form. My suggestion is the site should not close those form submissions when clicking outside the modal pop-up box, but instead users should explicitly click the "Close" or "X" button on the form, so they do not lose their information.
And/or if possible, save the form data in the browser state (cookies/session?) so in case the form is closed before submitting, users don't lose all the fields they've already filled out.
Thanks!