Every time I add or/and delete server sources from the integrated server browser or from sources.txt the list always resets to when I installed.
While sources.txt does change, the source list does not reflect the sources.txt at all.
I also can't seem to get the server list even with the QuakeServers txt file. This might have to do with Mac High Sierra security measures.
Please get the solutions so I can get to play Quake online.
Thank you.

Hello, you can try using a website to browse servers and connect manually to them, just open the console and type connect then paste the address. Like so

connect address

and hit enter . . .

quakeservers.net is one such site, you can sort through the various quake games there. Try this link to for servers with players in them
https://www.quakeservers.net/quakeworld/servers/pl=1/

I'm not sure about editing the files but I have the following server browser stuff in my config.cfg, you might try adding or changing these.

sb_sourceunmarkall
sb_sourcemark "QuakeServers.net"
sb_sourcemark "Global"
sb_sourcemark "Asgaard"