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That means more than one person shared it.
Let me know if you see the same tweet referenced more than once, I do have checks for that, but I am adding some new code to make it more bulletproof, but I haven't seen it post twice on the same post unless it is two different tweets.

in my case i was the one doing the tweeting of my post more than once (spanish and english) so, it would be nice to have maybe an option or a tag to put on the tweet to stop the notification of poshbot from happening more than once from the same twitter user?

Yeah only two different tweets but not the same tweet.