Extra Options problem

When using the extra options I got 2 erros.
1- after I input the check box of extra option on a room. I unable to remove it. I click on the check it desapear, I update the page and he keep on the say place. The only way is to delete the extra from the extra room list.

2- after I select the extra option, on the cart we are able to change the number of extras we want, but the price didn’t change at all.

Can anyone help me please?

The page I need help with: [log in to see the link]