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You should use a tool better suited for the work you seek. ps -AL will show you tons of stuff, probably having to do with terminals, side processes (like those roslaunch spawns to control the other processes), pipes and ptys and so on.

Either use TOP or HTOP to check on running programs.

I have a launch file I know works correctly and launching it and then checking with ps -AL I too have lots of apparently duplicated processes. Suggestion: when you don't know what is really going on under the hood, don't look under the hood, else you get confused.