I never post anything breaking, at least hardly ever... so it is not a problem... but some folks do and they post from different articles that have different titles and sources. I am sure it is difficult to catch them all.
I think it is important for "moderators" to realise that it is not being done "on purpose" to mess up the "sidebar" and also that folks DO check before they post... lag time IS a problem... and this is often WHY it is occuring.
When someone says something like "this is the eighth one of these I have pulled this afternoon", they sound like they are angry with us for NOT seeing the eight others that were similar (in their view) but are missing completely from ours... which has a different title from the ONE that was kept.
For what its worth... probably not much.