Follow the below guide to see why your warehouse reports X amount of inventory:

Go to the Products page>Click on the SKU of the item you wanna review inventory on.

You will get to the Product Details page. Scroll down to the bottom of the page where it says ‘Activities’. You can click on the square on the right-hand side to choose which warehouse you’d like to see inventory activity from. Then you can select the dates you’d like to see activity from (Last 30 days, Last Year, All, Etc.). Once you hit submit, all the transactions will pop up, showing you exactly how much inventory was received/sold.