When I test the Facebook API with my iphone 7, the [AddToCart] event sometimes triggers and sometimes not.
But the other events [View Content,Initiate checkout,Purchase] are all correct.
And all events are working correctly on Android phones and computers. Only in IOS the [AddToCart] event does not work properly.
I tested with three separate iphones and all had the same phenomenon
I use woocommerce+Google Tag Manager For Wordpress