I have noticed this happen to me twice now. Something that I posted shows up again days later. And I am pretty sure I was offline both times that it happened.
Here is one...
This is the original post
Forums at Splitcoaststampers
And this is the one that was repeated a day or two later when I know I wasn't online.
Forums at Splitcoaststampers
Now this one just happened...
original post
Forums at Splitcoaststampers
And repeated post 3 days later
Forums at Splitcoaststampers