Our developers are currently working on a solution to this problem, which should be implemented in the next few days. Once the fix is implemented, the duplicates will be removed automatically.
In the mean time, you can prevent these duplicate listings from being displayed in your store window is to make these item numbers hidden in your Auctiva Store at Auctiva -> Store(tab) -> Edit Store Items. Any items that are made hidden will no longer be displayed in your Auctiva store, nor will they be displayed in your store window the next time it refreshes, which it does about every 4 hours.
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