Colorbox too small in mobile Safari on large pages

Hello.

I’ve found a display problem when viewing colorboxes in mobile Safari browsers (iPhone, iPad). The colorbox will only extend over the portion of the page that is viewable when looking at the top of the page (including the address bar).

Here you can see the colorbox being cut off midway through the picture:

https://bit.ly/pbLjmB

And here you can see that same page when it is scrolled all the way to the top:

https://bit.ly/oCbA6N

When the site can be zoomed all the way out so that the whole page is visible, there is no display problem. I’ve tested this on a couple of different sites, not just my own, so I think it’s a general problem.

Thanks for any help,
-Bret.