In my opinion, we are living auto repost problem because of the post ids in the database.
Because of post revisions, my page ids goes like 6,15,49,400.(It should be 1,2,3,4)
So the plugin is trying to post empty posts. And after trying two or three times, it is giving up posting because of this.
We need a solution for this. I hope we can get a fix for it.