No Events in Catalogs even though pixel is working fine

Hey,

I have a Shopify store for 4 months now, FB pixel on it since the beginning.
It is recording events fine as you can see.

Then I discovered Dynamic Ads recently so I created a catalog in FB BM and imported my products with the Facebook Product Feed app.
I linked the pixel with the catalog but no events are shown...

Can you help me?
Does it take some time to update? Or maybe it only starts recording events when the catalog is created?

Thanks for your help.