Reply To: Parallax effect broken

If you want it to function like the other users site you linked to, then you would need to “uncomment” the background-attachment: fixed; on line 1504 in your CSS

.front-page-1,
.front-page-4,
.front-page-5,
.front-page-7,
.front-page-9,
.front-page-12 {
	background-attachment: fixed;
	background-position: 50% 0;
	background-repeat: no-repeat;
	/*-webkit-background-size: cover;
	-moz-background-size:    cover;
	background-size:         cover;*/
}

Then it should function in the same way.