Hovering over my images in shop changes the image, I didn't set this and can't see how to turn it off

Site URL: http://shipwreckkayaks.com

Hovering over my images in shop changes the image, I didn't set this and can't see how to turn it off, please could somebody let me know how to stop it 

Thanks, but this stops anything from happening when the link is clicked 

7 hours ago, georgescott said:

Thanks, but this stops anything from happening when the link is clicked 

Use this instead

.products.collection-content-wrapper .grid-item .has-hover-img img:first-child{
  opacity: 1 !important;
}
.products.collection-content-wrapper .grid-item .has-hover-img img:last-child{
  opacity: 0 !important;
}

Thankyou!