Ok, based on our recent conversations I hope this was the solution.
1) remove the following:
<border cornerradius="11" />
2) add the border element back into the following:
<listview.borderbrush>
<solidcolorbrush color="#99FFFFFF" opacity="0" />
</listview.borderbrush>
<listview.background>
<solidcolorbrush color="#99FFFFFF" opacity="0" />
</listview.background>
<listview.view>
<border cornerradius="11" />
....
</listview.view>