Sub Inv transfer is completed, but Serial number still has Group_mark_id and LINE_MARK_ID

We see that a serial number for an item which is in stock, is not available for use.

Upon verifying in the INV_SERIAL_NUMBERS table, we see that the Group_mark_id and line_mark_id are mapped to the serial number and item combination.

The corresponding Sub Inventory transfer is already completed but the serial number is still not released.

What am I missing to check here.