superaircraft's dashboard

I had this problem, too. I used twurl-shortening of the URLs at first, and double posts appeared. The twurl-link was different in an identical post. Now, I changed to tinyurl and the problem disappeared.

Hi, I've taken a look, but can't seem to see a reason for this. One thing I noticed is that twurl.nl creates a new short URL every time it's called with the same URL to shorten, so the check that is in place at twitterfeed (it compares the short URL to previous ones in your account) won't work with twurl (tinyurl appears to create the same shortened URL if called multiple times with the same URL, so it works in these cases).
However, this doesn't explain why the items were posted more than once, since the publish date should handle that (the above check would only be useful if for some reason items are re-published to a feed, with updated publish dates, and we want to avoid posting them again). I manually tried to replicate the double post, but can't seem to get it to do it. Could you see if this happens consistently, or was a one-off issue (if you like, post to a different account if you want to avoid the risk of double posts to your main twitter account)? If it happens again the next time you post, let me know and I'll try to dig a bit deeper.

Sorry for the inconvenience...