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The default value of 0 for both trip points is likely the cause. Adjust the trip points so that neither is at the actual On or Off values. The trip points should be values that occur as the analog input voltage is moving from On to Off and Off to On, not at the either point. Also remember that in digital mode GND is On. In analog mode GND is Off so the trip point for On to Off should not be 0. Perhaps the On to Off would be 20 and the Off to On would be 100. The Off to On value depends on the voltage applied by the pullup resister . The Off to On trip point should be below the value established by the pullup resister. .