I always depencies left around from the DE that was removed. Maybe it is because my commands are not the right one but I follow what is recommended by the distro wikis. Like if I am using gnome and then download kde just to try it out(without removing gnome), don't feel like using kde and remove it, I have packages and dependencies leftover from kde when I uninstall it. Neofetch too show an increase in packages even though the only action done was installing kde and uninstalling it