This might be possible because the added the opening quantity while adding the product and also created purchase for the same quantity. This results in duplicate stock.
To avoid this, please remove the opening quantity from the product section and check the inventory with correct stock.
Step 1: Go to “Products and Services” and click on “Edit”.
Step 2: Remove the Opening Quantity and Update the Item.
Please Note: If the you’re is going to enter the purchases then there is no need to enter opening quantity or do the manual stock in.