Transmit and Receive statistics of bond NIC not match the sum of slave NICs

Issue

• The Transmit and Receive statistics of bond NIC does not match the sum of slave NICs on my server.
• The bond is comprised of 4 NICs. From /proc/net/dev, the traffic volume of the bond NIC is approximately 200 MiB/s. But, the sum of the 4 NICs is approximately 900 MiB/s, which should be the same as the bond.
• The discrepancy can grow after reboot the bond NIC.