It looks like your Slideshow HTML has the following code towards the bottom of the page:
width="31" height="31"
This is forcing the images to display in a 31 pixels square. This is not code generated by Shozam!. Have you altered the code by any chance? I have heard reports that FrontPage takes the liberty to alter the HTML when using FrontPage Server Extensions. Is this your situation?
Generate the gallery and look at the code if it contains the code quoted above. If it does not, then follow your workflow and see at what point your files are altered to force the images to display at 31px.
Sorry for the delay in getting your issue responded to; our Help Desk is still in the process of being set up - think of it as being in Beta as well.