I'm not exactly sure what the problem is, but if you post a reasonably long post I recommend going into the article to make sure it is all there after you hit submit. I have read a few reports of other users having this problem (one thought they didn't save the post), but I just noticed my most recent article gets cut off halfway through. It definitely wasn't like that when I hit submit as I changed the order of the paragraphs after the article was completed.
Is there a potential bug out there, or just user error?