A product can be put on pre-order through the:
Preorder Products
Preorder Tags
Default Settings by enabling preorder for all products
Important Note: PreOrder Now follows a priority system: Product settings override Tag settings, and Tag settings override All Products settings.
How to Identify the Cause
Check Each Configuration Section
Review the settings in each of the above sections to see where preorder might have been enabled unintentionally.
Search for the Product in the App
Go to the Preorder Products section in PreOrder Now and search for the product.
Review Product Details on the Edit Settings Page
The app will show:Whether preorder is enabled for the product
Which variants have preorder enabled
The inventory level in Shopify and in the app’s database
If you notice a mismatch in inventory, click Sync Products to update the data.
Take Appropriate Action
Based on what you find:Disable preorder settings for that variant or product
Delete tag-based settings if necessary
Adjust All Products or default settings as needed