Love App Tabs but have several that just show a white page as icon how do I get them to appear as a site logo?

I love the new App Tabs but have several that when pinned just show a white page as the icon, so you have to mouse over them to figure out which one is which. Example is bankdirect.co.nz. Is there a way of getting the site logo to show up so you can see what is what at a glance but still have the nifty space saving size of the App Tab? Thanks!
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SergZak
Thanks for that. I have to say that there were a couple of screens that appeared to show both the iPhone and iPad and it was the iPad that was showing the icon!
It is not life threatening, I just thought that something had not installed as it should have.
Demo
Thanks for your comment.
Cheers
altv