Did you look at your page source? Use the Facebook Debugger? I’m willing to bet it’s in there. FB decides to show larger images it favors more first instead of other images it may deem smaller or less important. The plugin help explains the current process. So it’s doing exactly what it says it does in the description.
The next major version of this plugin will handle images differently though because Facebook is picky. So without you being more specific to Facebook your featured image will be the only thing FB sees instead of an array of all the images found.
Thanks for the review though. If you have questions feel free to open a support request as I’m pretty on top of those and can explain how things work.
Cheers
