Facebook pixel not registering sales (Shopify)

I have the Facebook app installed and configured/connected on my Shopify store.

It's however not tracking purchase events, all other events seem to be correct as impressions, add to cart etc. are tracked. Currently it only shows 2 tracked purchases but there are a lot more purchases where Facebook is shown as the referrer on Shopify.

Does someone know what could be te issue?

I was just reading about this today. Apparently new laws and push back on tracking companies like Apple make it hard for facebook to give accurate data. There are 3rd party options though to represent the data properly. Here's a video that compares 2 of them: