Shopify Purchase Pixel Issue

Hello Community

This is my App ==> https://apps.shopify.com/alpha-pixel-best-facebook-pixel-and-facebook-product-feed

We got complain about Purchase Event Missing on FB ads Report

I personally Check my client ads + shopify store stats its huge difference on Sale + reporting 70/30%. but shocking is this we are receiving all data(purchase event ) accurate on Event Manager

but issue is real time FB ads reporting is not working.