I'm not sure if this is intentional or not but I want to report just in case it may be a bug:

When hovering over a product image that has more than one image, the image changes when hovered upon.

hi,

Of course it is was intentional. It is a feature, indeed a very important feature of CleanMart. (actually one of the features that makes our Virtuemart Template unique).

To disable that feature, you should just UNDO this modification (do the opposite):
www.flexiblewebdesign.com/forum-virtuemart-2-template-support/1410-tutorial-2-multiple-thumbs-in-category

Remember, you did this when you first installed the CleanMart, if you retrieve your changes back to factory settings, you won't have this imageSwap effect on category page upon rollover.

Regards.