I have been using this mod for as long as I remember and never had this issue. But after updating to my entire modpack to 1.4 I noticed weird thing happening to my lights. For example: lights switching when there is activity in adjacent rooms ( this bug somehow fixed itself and I never saw it again) and the keep light on option getting randomly ignored. Its especially annoying since I play with the darkness curse from vanilla expanded. And as for the lighting related mods I use: wall lights and the simple utilities ceiling lights. I tried to check if any exceptions poped up that could indicate as to what was happening but the logs didn't show anything strange. I love this mod but this weird bug makes it very annoying to have.