New forms are broken
Try opening an existing form, add a few headings, dividers, or just make a few changes and watch how many times the form UI crashes back to the sheet from which it was invoked.
For me it's crashing about 6 times per form where I am making about 10-12 cahnges.
Thanks for releasing broken software that makes my life harder, Smartsheet. Always nice to be a beta tester and pay for the privilege.