Ok... I've been playing with this for awhile. It seems like the size of the image that is downloaded is correct. I think. When I go to the viewer, the size is smaller.
So I tried to figure out how big from the viewer, and got to a "Web Inspector" window that gave me this:
<img height="1061" width="700" src="images/00008.jpg" class="calibre_40" style="height: 593px;
width: 391.235px; ">
Where is that style attribute coming from? And more importantly, can I override it somehow?