Raptor camp seems to function like theres a pool of spawns, say 20 raptors total. When one dies, a clock starts ticking to a single respawn. Kill one, get one respawn in 5(arbitrary time) minutes. Kill all 20, 1 spawns at the 5 minute mark, another at the 10, 15, 20, etc.
Doesnt explain why crap insta spawns in other rooms, just an observation from the Young Raptor camp.