I have performed some testing on this and have looked over your page. I think the problem may be the way you have incorporated your submit button into the repeat selection. If you have the button outside of the repeat selection I think it may work for you. Other than this it seems like your page is nearly identical to mine. 
When I initially set up the repeat region the button is out side the repeat region... after applying delete multiple it appears with in.... Can you please provide me with an updates version on my page that works, so I can compare and fix the issue.
Thanks


