It looks like they also gained over one million subscribers in the quarter in the US/Canada, and average revenue per membership dropped from $16.18 to $16. It was technically a bigger subscriber gain this quarter than they had in 2021 and 2022 combined. (In 2021 they gained a little over one million, but in 2022 they lost nearly one million.)
Some people paying for the top tier for extra concurrent streams probably dropped to a lower tier. Then some of the people they shared with may have also joined at a lower tier. Both would drop the average.