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Low tire pressure

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HI, Please advise if anyone know why there is an warning light of tire pressure low, but the number appear next to it is increasing from 38 PSI when I drove to work in the morning and 40 PSI when I was on my way home? It is counter intuitive that the number increasing and not decreasing as it is warning me that the pressure is low? Any advise is greatly appreciated.
 
Tire pressure rises with heat not sure what ur weather conditions are ..but I can measure cold at 45psi where I keep my tires than after driving a bit not unusual to see 48psi when taking a reading