Issues going to High School

I sent 3 sims at the same time to High School and I started seeing bugs, the headmistress was bold, I couldn't see the tasks with all three students. From that moment on, The first sim returned home but the others were stuck. I have been shutting the game down for the last few days and I have managed to get them back home, but since then, these two go to high school without the notification of controling them in high school, they are unable to do homework, their icon doesn't get shadowy and they come back home with the icons of being at high school. I have tried to rest the sims but it doesn't help.