Slapyo - I've just had a thought about why it might be duplicating posts for certain forums. If you've included the slight code modification highlighted by yourself in
Post 222 of this thread (which strips HTML codes from the thread title), then could it be that because tags are being removed, the titles are different. Therefore, when a comparison is made, they fundamentally look different and therefore get posted as a new thread?
The reason this happens for some forums and not others, is because some RSS feeds don't use HTML tags and some do?
What do you reckon?