PC Halo Reach Forge Lighting Bug

I was building in ForgeWorld and was going to add some lights, specificly the “Light, Red/Yellow, Flashing” objects. But I noticed when the animation for the light is at its brightest, the area lighting is completely off. Then when the object dims to off, the area lighting brightens. I’m assuming this is a bug, but I haven’t noticed it mentioned anywhere else yet. Is there a way to fix this or is it just how it is for now?