It is on the 2017-2018 high school page of the Washington Wrestling Report, 3rd bullet point down titled "Seeding Criteria for Mat Classic".
It states the highest returning state placer gets separated from the other two. Returning means returning from last year, ex. a 4th place finish from 2 years ago can't be called a returning 4th place finisher. Another wrestler earned that claim. Again "returning" translates to the prior Mat Classic.
WIAA seed these brackets as your criteria states it should be followed. These kids work hard and should be seeded correctly, check the 132 4A brackets for this repeated error.