How the KK_QUANTITY increase on the KK_ACTIVITY_LOG and why does not match with KK_LIQUIDATION table

I have a situation where the user created a requisition with 2 lines and sourced it to a PO. Then, the user scrubbed the req from the 2nd PO line and then deleted that line. Also, changed the PO to Amount Only but the requisition was distributed by quantity. The 2nd line on the requisition was canceled and then 2 Vouchers were created against the PO Line 1. It looks like after all these changes, the system keeps increasing the negative pre-encumbrance row on the Pre_Encumbrance Ledger every time the FS_BP process runs. We have the FS_BP process scheduled to