I was told by the eCommerce developer that the issue is with the template related with "modal" which seems to be a pop up conflict.
They provided the following and instructed to create a custom file:

/* For Model fix */


.modal-content {
border: medium none;
box-shadow: none;
}
div.modal {box-shadow: none;border: medium none;background-color: transparent;}

.gantry.contentpane.modal #g-page-surround {
background: transparent none repeat scroll 0 0;
box-shadow: none;
overflow: visible;
}
#wzpOpUp.modal {
width: 100%;
margin-left: 0;
left: 0;
}
#wzpOpUp .modal-body {
overflow-y: hidden;
}
/* end model fix */

The code removed the middle window, but did not solve the issue. Please see screen shot.
Thank you.