It’s broadcast seasons vs how many purchases (“episode orders”) were made. Fox aired 5 but paid for 4 (held back some episodes), then the movies, Comedy Central aired across 4 seasons but made 2 episode orders, and now Hulu split their first order across 2 aired seasons.

Aired: 5 Fox, 1 movies, 4 CC, 2 Hulu -> season 12.

Orders: 4 Fox, 1 movies, 2 CC, 1 Hulu -> Season 8.

(Hulu made a second episode order already, but since that wouldn’t start until at least next year I didn’t count it. Assuming it’s split again, it’ll be seasons 13+14 or 9.)