this year on the Reading subscale obtaining 28 out of 30 items correct resulted in a Reading subscale score of 19; earning 29 out of 30 items correct resulted in Reading subscale score of 22 and earning 30 out of 30 items correct yielded a Reading subscale score of 25.
Wow. Yes, it was the reading. Did your district post scaled-to-raw-score conversions, or something else that allowed people to know how many answers they got right?
(NUMATS reported that no kids scored 24 on Reading, which I assume indicates that no raw score mapped to a 24, but there were kids who scored 20, 21, and 23, so presumably there were some versions of the test that scaled up differently.)