Narrow portrait screen issue

[philw...@gmail.com]

Sly is working really well apart from when the viewport is narrow and portrait (like an iPhone). I have an image within each of the <li> tags in the <ul>. In landscape mode, all the images appear as normal. On a narrow portrait viewport only three images appear and clicking "next" takes you back to the first image.

Is this a known issue?

Thanks in advance!