Orders rejected by risk control are initiated by Aliexpress. You may be able to get more insight on this at the Aliexpress Buyer Service or Customer Service at this page: Help Center
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Users can easily locate those orders in our filter, but click under "Supplier Status" for Rejected by Risk Control. https://app.dropified.com/orders/track

If you need to re-order, you can select those orders in the Tracking page, then use the Bulk Action in the upper right corner to "Delete Order IDs".
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Finally, you can now replace the orders through Place Orders page again.