This is a fairly old bug that is more annoying than harmful, and there is a bug report for this at https://bugs.launchpad.net/ubuntu/+source/indicator-applet/+bug/1575655. The workaround is to restart Network Manager by running:
sudo systemctl restart NetworkManager
If you want to bring this bug to the developers' attention, please visit the bug report that I linked and click on "Yes, it affects me".
One reason for this behavior of NetworkManager (applet) might be that some kind of virtualization software is installed (e.g. qemu/kvm or VirtualBox). If this is the case NetworkManager handles the virtual interfaces as wired networks instead of ignoring them.
As a workaround you could force NM to ignore these interfaces by adding this to