It's highly recommended to check the stock once a week/month.
In order to check the stock, please follow the article
1. Open the Magento Backend - https://webstore.arcadespro.com/index.php/admin_ifdpyk/
2. Click on "Inventory Management" From the side menu
3. Click on "Stock-taking"
4. Click on "Create New Stock-taking"
5. Select the Source, Fill the details and click on "Save"
6. Click on "Add Source Products"
7. Select the products and click on "Add Selected Products"
8. Click on "Start Counting"
9. For each product, Enter the qty that you currently have in your stock
* You can add a reason in case of difference
10. To Complete the stock-taking, Click on "Complete Counting"
To save the changes and continue editing later, Click on "Save"