@jlenney @stephcerratti
I was experiencing this issue too with Thrive Architect. Apparently, when loading a page in the Thrive Architect page builder with Jetpack (or any other plugin that manipulates the end HTML rendering) it caches and saves the image element (and many other elements) as pure HTML code with all the lazy load classes attached. So even when you remove Jetpack it still has the lazyload classes cached and stored. This problem is caused by Thrive Architect, the only way to remove it is to use their HTML editor in the advanced settings to manually remove the classes.
