In Minecraft the light level is at 15 at night, and there isn't any moon out. I'm in a swamp biome (if it makes a difference which biome you are in) and the light level is at 15 (max, as the day).
I've been there in two nights in a row. No monsters are spawning either. I'm playing in a private multiplayer server and monsters is spawning natural (it's not in peaceful). No mods, no plugins, Minecraft Version 1.8.9.
What is happening here? How can I fix this?