The Echo RSS plugin checks possible images that can be used for imported posts in a specific order:

1. the image found inside the RSS feed for each item

2. the image found in the og:image meta

3. images found inside of imported post content

Please try checking the ‘Skip Checking Feed Image’ checkbox in importing rule settings, for the rule that creates these posts -> save settings -> check if images appear differently. This will skip checking of the image found inside the RSS feed.

If this is not helping, please try checking the ‘ Skip Checking OG:Image Meta’ checkbox in importing rule settings, for the rule that creates these posts -> save settings -> check if images appear differently. This will skip checking of the image found inside the og:image meta field of imported posts.

If this is not helping, you can also try checking the ‘Don’t Use First Image From Content’ checkbox from importing rule settings, this will make the plugin skip the first image it finds and check the next one.