App storage does not show the correct size

[Microsoft Windows]

My computer has 1tb of storage. My Apps folder shows that I only have 124GB of storage and it shows that I have 71.3GB used. When I add up all of the apps manually, it does not match the amount listed on the storage app. How can I get the amount shown in the storage app to match the actual amount of storage that I am adding up. I downloaded Treesize but I do not know what I am doing. Thank you.

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