Hi @Rosalynmitchell ,
have you checked Pixel, the diagnostics and test events? Does it show any errors or warnings? I would definitely try the test events to see if the purchase event is fired only once when a purchase is finished.
The results look definitely weird to me – reach is around 2000 and in total, the FB analytics show 56 purchases for $0.36, which doesn’t make sense to me. How about your Shopify analytics? How many purchases do they show?