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The main reason is that if any content published first time and indexed then after that index any publication of the copy is duplicate, however your duplicate copy is also indexed and it depends on the page rank and other quality of the page to be shown in the SERP position.
If one article was not indexed from different sites then you wouldn't have seen many results of one article in search engine.
What I am trying to say is of copy one paragraph from articlesbase.com and put it in Google with quote then you would find that many directories are displaying that paragraph, it means the article was submitted to many directories. And multiple sites were indexed.
So no matter if you publish on your site after submitting the article to directory then it may be indexed.
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