'Reverse Goal Path - Goal Previous Steps are not the expected ones

I work for an e-commerce company and we use google analytics to track interaction on the website. I am using Reverse Goal Path to find which pages yield a higher conversion rate. On our website, the payment page is the only way to get to the order-confirmation page but somehow when I set order confirmation as the goal completion location, the previous steps are other than the payment page. This does not make any sense to me. Is there something that I am not considering? How are the goal previous steps actually calculated?



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