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There could be several potential reasons for this discrepancy. First, check the setup of your Google Analytics ecommerce tracking – it needs to be correctly configured to register transactions. Secondly, ensure that your payment gateway page is not blocking tracking data from flowing back to your GA account once the payment has been made. This could be a problem especially if the payment confirmation page (which confirms and sends the ecommerce data to GA) is part of your site’s funnel. Also verify whether your redirect doesn’t result in loss of session data. You might also need to implement cross domain tracking if your payment processor’s URL is different from your website’s URL. Lastly, if the problem persists, you may need to implement additional tracking scripts that specifically capture post-purchase data. It may be helpful to seek advice from an analytics expert or professional who can study your setup closely.
