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It could be possible that the transactions are being sent twice from your website to Google Analytics, hence the duplicates. This could occur if, for example, a user refreshes the order confirmation page, causing the data layer to be reshared. To resolve this issue, you may need to implement a solution that prevents the data layer from being shared again once the transaction is initially processed. Additionally, if you are unable to identify an issue with your data layer setup, it might be beneficial to seek assistance from someone well-versed with Google Tag Manager as they could better identify if your tags, triggers or variables are set up incorrectly.
