Add-to-carts don't get tracked in Shopify analytics

[sp1234]

For a few weeks now, I've had a problem. Customers who come to my website and add a product to their cart are not showing up in my Shopify analytics. Checkout achieved and converted, however, do. Has anyone experienced this before and a possible solution, as this has a lot of impact on tracking the right data and my strategy. 

[Linuss]

Exactly the same issue, please let me know if you found the solution