I have the same problem as described here:
https://www.8theme.com/topic/single-product-image-gallery-problem-with-resposive-view/#post-280178
I am certain that this happens since the update to 7.2.6
Please resolve asap.
If a product has more than one photo in gallery and in: customize/ single product layout> the option ‘Product Gallery Slider’ is enabled- the single product page on mobile gets a huge gap between the product gallery and the rest of the content…