First, I don't seem to have duplicate sources in apt, because via the terminal I get

$ sudo apt-get update
[sudo] password for user: 
Hit:1 http://archive.canonical.com/ubuntu xenial InRelease
Hit:2 http://us.archive.ubuntu.com/ubuntu bionic InRelease                     
Hit:3 http://us.archive.ubuntu.com/ubuntu bionic-updates InRelease             
Hit:4 http://us.archive.ubuntu.com/ubuntu bionic-security InRelease            
Hit:5 https://brave-browser-apt-release.s3.brave.com bionic InRelease          
Reading package lists... Done     

Yet in the Software Updater's 'Other Software' settings window, I have multiple repeat entries:

Important security updates, Canonical Partners, and brave-browser are listed multiple times.

How did this happen and how do I correct it? Shouldn't there only be one item per source, especially since there is no text to distinguish differences?

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