Why your bot is sending duplicate messages?
So if your bot is sending duplicate message, it might be the following reasons:
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For messenger channel, It’s possible you connect more than 1 app in your page advance settings. Please make sure you only connect UChat app to your page.
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For WhatsApp cloud API, it’s possible that you used the same webhook URL in two different apps in your Facebook Developer account.
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That’s the most common reason, please double check above points, if you still have questions, do send email to our support.