Upper layer 1 1(4)

2

Bottom 1 1

1 1 1(3)

Oh, sorry, there are only seven (the extra squares are marked with "2")

In fact, the top of box 3 (marked with "3" in brackets next to it) has replaced the top of "2", and the front of box 4 has replaced the front of "2", so "2" has no value and can be deleted.

By the way, teachers are human. When you find a teacher's mistake, you should boldly point it out. No matter where you are wrong, you are the best and the best.