Is it possible to Lose an already Won Chargebacks?

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Recently, we have noticed that some of our already Won Chargebacks weeks ago had suddenly turned to a Lost Chargeback very recently. It started about 2-3 weeks ago. A lot of these items had been Fulfilled and Delivered but turned out this way. How is this possible and what are the best ways to address this as this is definitely costing a lot? Thanks ahead for your insights.