Hi Skandha, I have identified what the issue is. I have recently created WebP versions of the images, using the Imagify plugin, to help with page load times. The recommended setting is to use <picture> tags although it does come with a warning that this method may not be compatible with some themes. Having now changed to the ‘use rewrite rules’ option the images display correctly.
You may wish to check that this plugin is suitable for use with WebP, as well as the RockStar Pro theme.
What are your thoughts?