1) what are these set to
Product Info - Image Width
Product Info - Image Height
as those are both the hover settings and the productinfo page image settings.
Have you made any changes to the standard Image handler? as you seem to be using the large image as the image hover rather than the medium image (using the medium image is the default hard coded behaviour)
At a guess I would say the default behaviour has been altered
In your
includes/classes/bmz_image_handler.class.php
Find the following (around line 697)
it should say this
$zoom_sizetype = ($this->sizetype=='small')?'medium':'large';
if it says
$zoom_sizetype = ($this->sizetype=='small')?'large':'medium';
then thats your problem.
Other wise try clearing your Image handler cache via the admin
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