Debugging jQuery Animation

Debugging jQuery Animation

I am using a page flipping plugin called "bookblock" (demo can be found
here).
I have put images on each page, which I am adding dynamically. The problem
is when I flip the page, the previous and next divs are suddenly squished
together on each side of the book. The following screenshot is taken
mid-animation of a page flip.

As you can see each page in the book is "item1", "item2", etc. All of the
display properties are set to "none", but for some reason they can be
seen.
A live version of this site can be found here. I have tried adding
$(".bb-item").hide();
Right before the animation sequence, which appears to begin on line 259 of
js/jquery.bookblock.js, but no luck. How else could I go about debugging
this problem?
UPDATE: I am very sorry, I should have mentioned that you can access the
flipbook by clicking on the "expand" icon, in the bottom right of each
div.