I was using this plugin with no issues over on https://directorsnotes.com however, either the last update of the plugin or updating our site to WordPress 6.6.1 causes ‘some’ images in posts to have a Rendered Size width of 300px max regardless of the actual image size within Chrome – the same images render correctly in Safari & Firefox. Deactiviating Enhanced Responsive Images and refreshing the previously affected posts immediately fixes the issue.