Thank you for sharing the links! I do have the user redirect to a different page after submission. If a user stumbles upon this form, they cannot submit it again. They are shown a message that they have already submitted. So, if a user stumbles upon the form again, I want them to be redirected to another page. At the moment the redirect happens only when they submit and not when they stumble across the form again.
I hope that makes sense.
In the form settings, there is a tab called Limit, and I have limited it to only 1 submission.