Duplication of Feature Image on top post

As I make posts, and any numbers of them at a time, the last post which on the front end is the topmost post, duplicates the feature image, or if no feature image then it duplicates the post text itself. What would be causing this? The lastest here:  https://eatonia.ca/ is not a good example as there is no image for the latest post but it does show duplication of the short post itself. If, for example the Newsletter below it was the latest (as it was just prior), then the feature image would be duplicated. It started doing this at one point all by itself.... and I have no idea what is causing it.