Cost data is not flowing down to channel customer level that is configured as Consolidated.
One of the reasons could be that the customers account/s moved between payer accounts but the customer's Partner Generated Billing (PGB) block has not been updated. To resolve this, delete the existing billing block and create a new one using the new payer account as Billing Family and select the customer's accounts from the list. PGB will stitch the bill automatically. If you see any data gaps please reach out to support.