To correct stock sometimes you have to delete items out of stock if entered incorrectly. To start go to inventory, search for the product you want to modify stock.

Step 1: Once you see the product click the black QTY button in the top left corner to open up the QTY

Step 2: Then click the most recent of the entry at the top if your products are not serialized.

this will pop up the ledger for when that stock was imported, from this new pop up window click the

It will ask if you are sure, click yes to confirm and the stock will now be adjusted down by 1 item. repeat the process as needed