Today, a friend told Naiba that his website was built with Avada and the server uses SiteGround. After he upgraded the theme version and set thumbnail sizes, some images on the website stopped displaying.
Naiba checked it for him and found that the issue was with the lazy loading feature for images. Just turning it off solved the problem.
This lazy image loading feature was mentioned in the previous articleHow to Use SG Optimizer to Optimize Website Speed on SiteGroundas mentioned in it.
After enabling it, there may be compatibility issues with some theme code, so just turn it off directly.