gallery in products page not showing

i have been trying to fix this issue with lazyload of wp rocket.
all my products gallery pages not showing all the photo in gallery only one.
below is my website:

[ redundant link removed ]

but everything works fine my website is super fast and i have very good grade in terms of rating of website speed but when it comes to products pages not all images showing in gallery and my fullscreen button also failed to work
below are few examples of my products page:

/products/whiteboards/glass-whiteboards/luxury-export-glasswhiteboard/

/products/whiteboards/glass-whiteboards/momtaz-glasswhiteboard/

/products/whiteboards/glass-whiteboards/glasswhiteboard1stgrade/

i have tried this solution but it didnt work for me

please do advice.

The page I need help with: [log in to see the link]