Ever since the latest update, this plug-in has been listing the same post twice. I have tried the flush method that the plug-in author suggests to no-avail. When I flush, it flushes all the previous posts, but then any new ones start duplicating again. Additionally, I am not using any custom templates. I wasn't having this problem BEFORE the update.
You can see an example of the problem here:
The related posts are showing the same article about the LeapFrog book twice.