Malfunctioning battery switch and avionics switch

Sometime ago, I downloaded a small addon which starts you out in a cold dark cockpit. But today when I was flying a Skyhawk in my flightsim, the battery switch and avionics switch were in the off position, but they were on. I tried flickering those switches several times and it doesn't work. Not only that, the clock, radios, naviaids, and the panel light (at night) were all on, even if the battery and avionics switch were in the off position. So far, I discovered that only the default 172 Skyhawk and the default 737 were the ones with this problem. I haven't tested this problem for other aircraft yet. How can I fix this? Help please!