Quantity calculation details in time series

From the time series inquiry, where does the quantity in bucket comes from (e.g. the quantity in “-FWO” and “-FWOU” bucket under the due date column)?

In fact, as you can see in the Supply & Demand details (see screen below), there many work order lines, with some as demand. The total of those lines does not match the quantity of 7 in time series bucket above.

Here are actual MRP set up

Parent item manufacturing data in Item branch

Child/component item manufacturing data in Item branch

R3482 Processing Options set up

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Notes :

Production number tracking process is used.