Inventory tracking - resetting to 0 after sale

I have added inventory and inventory tracking to all my products, but for some weird reason, after a sale the stock goes from ex. 40 to -1 an sold out instead of going from 40 to 39… Anyone know what the problem might be?
Thank you!

Might be worth sharing a screenshot of what you’re seeing. The inventory change screen reads a bit weird if you’re not used to it so it might just be a misunderstanding. If not, the inventory change that’s responsible for what you see will be listed there.

https://help.shopify.com/en/manual/products/inventory/managing-inventory-quantities/track_inventory#viewing-your-product-inventory

Hi, when I print this

{{ product.metafields.custom.add_product_to_show }}

I got this gid://shopify/Product/8019965837629

how can I show the above product title and description?