Product Site Clarifacation on What the Logic is

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Hello, am wondering if someone can explain the logic behind Product Site Default Location setup? Problem: Snap shot above is how we are picking our apparel for replenish to work, but I don't think it's setup right 100%. Does anyone have any expierence setting up product flow in Sage that is somewhat like picking replenish able products. We have a pick face that we store apparel from and replenish from an overflow location. It works on most product but there's a few that it allocates from the storage location which is something we don't want to do. This is a bat signal question to anyone that can help.