Facebook conversion reporting

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Looking for some insights into conversion reporting for Shopify stores with regards to Facebook Ads Manager. I’ve read that the attribution window differs between Facebook and other platforms, meaning that the purchases shown on the Facebook platform often won’t match that shown in Google Analytics. However, when looking at our data from last year, Facebook is trying to claim 157 of our purchases, whereas Google Analytics is reflecting that only 37 purchases were attributed to traffic from Facebook (mobile + desktop). Can anyone provide any insight into why the discrepancy is so large?