Kami assignmt posting to all students in google classroom even when selecting only some

Issues with teacher assignments on Google Classroom posting for all of my students even though they select only half (A or B) of the class. Any idea on how to fix this? The pattern seems to be if you schedule to post at a later date it will post to everyone. Teachers had to go back and change it manually after they posted.

Hope everything worked out im sorry nobody saw your post