Sorry for a delay.
I’ve select “Native WooCommerce product editing screen” in Settings http://prntscr.com/ebj7pt and created new “test” product. It is working fine now. Please, check.
As about products what you have already, you need to go to edit product and re-write link to the image for hover effect where it needs. I’ve done it for this one http://prntscr.com/ebjaau