NICs statistics mixed up

My system has 2 network adapters - onboard realtek (eno1) and pcie dual port intel (enp6s0f0 and enp6s0f1). I use ip on eno1 for WebUI so there is almost no traffic, and I have a an ip camera configured to store video to the ip of enp6s0f0 which transfers about 5Mbs. But graphs in omv performance statistics (and also values shown by saidar) show traffic values the other way round. Report tab shows everything as it should be in network interfaces section, I can also see opened connection from the camera to ip of correct NIC. So - any reason why that may be?