Created attachment 144721 [details]
Image of one interface with about 135Mb/s traffic and another with no traffic.

SUMMARY
I have two wired connections active and one of them usually has no active traffic. I've configured a widget to show the composite upload/download statistics and the widget seems to cycle between the two connections when showing the traffic rather than add the traffic together. It also seem like the traffic is doubled. In attached image the actual Downstream traffic was 134 Mb/s.
The sensors used are Network Devices->All Network Devices->Download Rate and Network Devices->All Network Devices->Upload Rate

STEPS TO REPRODUCE
1. Add second active interface 

OBSERVED RESULT
Network traffic bounding between actual traffic and zero.

EXPECTED RESULT
Showing combined traffic.

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma:  Debian testing
(available in About System)
KDE Plasma Version: 5.23.4 
KDE Frameworks Version: 5.88.0
Qt Version: 5.15.2

ADDITIONAL INFORMATION