This is by design. When you attend High School the game generates random NPC to fill the class.
Oh yes. This frustrated me too. Simply not enough class mates and then only random. Even in the village I grew up we were more at school.😃
But it is the way it have to be. Look we have a limit of 20 sims on a lot. 1 Principle, 1 Janitor, 1 Cafeteria vendor, 2 teachers and 2 fire fighters for the fire drill day. Thats already 7.
So with 12 students, there is only a buffer of 1 sims left for walkbys, grim reaper or whatever. Even the creation and the randomness of the teens is normally a good
feature as most of us just want to play and not do a complicated configuration.
