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Pressure rise expansion tank?

I was doing a boiler start up and set the system static pressure at 12 psi and the expansion tank pressure at 12 psi. After the system came up to temperature (180°F) the pressure was at 14.5 psi. I checked the sizing of my tank and its sized properly per amtrols sizing chart for a 125k btu CGi-5. Is this normal or is there a problem?