I tested your contact page and it is doing the same thing to me. Even using a different computer this time. I thought maybe the reset button would do the trick, but it still resets to what I typed in even after it was deleted. Something is just not right huh? I started with the contactus.php code and copied it into my existing page. Last night I was hoping the problem was that I put it into a table td and not a div, but since yours in in a div and the same thing is happening again, this doesn't make sense.
I really do appreciate your help and maybe like you said the WA support today may have other suggestions. In the mean time I will pour over your code and see what changes there are compared to mine.