Images blurred when using woocommerce “wc-product-gallery-slider” and “wc-product-gallery-zoom”

Hello,

I noticed one little problem after upgrading to Multicorp 1.8 from 1.7
Product gallery images have significantly lower resolution and product image slider skips to next line for some unknown reason.
Is there a chance to have the same behaviour in 1.8 as in 1.7?

Below links to screenshots taken from each version product page gallery.
Multicorp 1.7
Multicorp 1.8

Thank you for helping.