Lazy Loading option issue

Hi all,
I’ve checked the “load images on scroll” option in my Customizr child theme and this causes some images in several pages and articles not to be loaded at all.
Could it be some conflict with W3TC configuration?
Besides, I have pages built with Siteorigin Panels, new articles in Gutember, old articles with classic editor.
What would you suggest to check?
thank you for your tips.
Sara