I had similar issues but I found a solution that works for me, here it is: I'm using Flatsome and a plugin called "Photo Reviews for WooCommerce". If I simply import reviews with the Alidropship Woo plugin, I can see the images attached to the reviews, however if I click the images the page goes to the image source, which means black screen around and a bad user experience IMHO.
The problem is that the Alidropship plugin adds the review images under "Additional Info -> Gallery", meanwhile my review plugin recognizes its native images directly under "Photo". So what I do is manually delete the ones from the "Additional Info -> Gallery" and add them to the "Photo". It's not very scalable if you have thousands of products but I want my product page to show a nice pop-up when a user clicks a review image.