Hello Chad,
Thanks for writing in!
I installed the plugin on my local dev setup and after that I activated default Twenty Nineteen Theme. Over there also the hover effect is not working. So it’s not a problem specific to X Theme.
Further researching about the plugin and it’s support page, I came across bunch of tickets wherein users are facing issues with hover. Here’s the support page of plugin:
https://wordpress.org/support/plugin/woocommerce-product-image-flipper/
In that regards it seems that the problem is related with plugin and providing support for third party plugins falls outside the scope of support we can offer.
Thanks for understanding.