Sweeps marked as Duplicates until I reopen Ninja

This Madewell sweep was highlighted in red when I added it to "My Sweeps". It requires a captcha so, I carefully looked through the "Ninja Sweeps" and could not find it. I've had several sweeps highlight in red and I could not find them, I've just assumed I'm overlooking them somehow and deleted them.
With this one I added it, It was highlighted in red, then I closed Ninja, reopened and tada it was no longer red.
So now I wonder how many I've
http://madewell.promo.eprize.com/benefitsweeps/:b=firefox12/
With this one I added it, It was highlighted in red, then I closed Ninja, reopened and tada it was no longer red.
So now I wonder how many I've
http://madewell.promo.eprize.com/benefitsweeps/:b=firefox12/