Why is the Order number Not on Payouts Details page.

I have a payout that I recieved yesterday for one single order. In the payout details it does not describe what order this payout is for. We have orders at this price often so identifing which order is being paid out is crucial to track payment status. I saw a payment scheduled for February 1st has the same situation with 2 new orders and no order number identified. Why is the order number not being applied in the payout details?