Weird Minecraft Light Issue

[Jtalk4456]

So I have a pretty heavily modded MC world and it's great, have been running it for a while no issues whatsoever. Suddenly the other day, I've got creepers spawning in the base level of the building we're using. The building is the prebuilt home inside the generated Castle from the Medievalcraft mod. So that's all I've got going narrowing the issue down, but it gets weirder then. The building has a bunch of wood logs in it as support beams and every beam has torches all around it. So the place is stupidly well lit. So I checked the light levels and sure enough, I'm getting 6 and 5 literally standing on a torch in the room. torches are supposed to give off 14 light, so this shouldn't be happening. And mobs spawn 7 and below, so that's the issue. I went outside the room and light levels work normally. I can place a new torch in the room and the light level doesn't move. I'm gonna look at the page for the mod later, try checking light level in another of the same structure, but i was wondering if anyone has ever dealt with something like this