It sounds like you're encountering an issue with image rendering on your WordPress site, where images appear differently in the preview versus the final live version. This could be due to several factors, such as browser cache, image size and resolution, or even how the theme handles image responsiveness.

First, try clearing your browser cache or viewing the site in an incognito window to rule out caching issues. Additionally, ensure that both images are the same resolution and dimensions to avoid any automatic resizing by WordPress. It’s also possible that the theme or a plugin might be applying different CSS rules to each image, which could cause them to appear differently.

Learn more about optimizing images for WordPress and troubleshooting common display issues to ensure consistent image appearance across your site.