I have a woocommerce shop website and in the single product page i have this issue about clicking on the main image. The site redirects me to a page with the image link instead of showing the lightbox.
WordPress woocommerce lightbox popup doesn’t work
It is since Woocommerce 3.0, I think they changed the way to zoom image. I fixed the issue by adding
add_theme_support('wc-product-gallery-lightbox')line in mainfunctions.phpfile of the theme.