When you add nodes to an existing node pack, the initial node fees are pro-rated to match the current fee due date for the pack. This prorated node fee is included in the node create transaction.
This is different from what you might be used to with original Ethereum nodes, where the initial 30 days of node fees are included in the node create transaction.
- The existing node pack fees are due in 10 days.
- New nodes are charged a prorated amount for 10 days of node fees, so that they match the existing node pack due date.