It sounds alot like it is producing alot more power than 120 volts per leg you should really only have plus or minus 10 percent of that voltage anymore will blow lights check voltage output with meter, if voltage is high may have problem with voltage regulator and it may need be replaced. I assume that not all of the lights in the house are on the same circuit therfore not on the same leg of the generator so is probably only one leg of generated power to high there for only blowing some of the lights
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Did you check the voltage from your Generator?
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