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If you have an outside temperature sensor and the outdoor temp is below the setpoint, the emergency heat will come on and lock out the heat pump. See below:
Does your thermostat show outside temp on it?
There could be a problem with your furnace if that is your regular heat and then since the thermostat is sensing gas heat is not keeping up, it kicks on AUX heat.
Might want to try powering off your furnace and then back on thereby resetting it.
OK, I don't know anything about your system. Do you have a heat pump with backup gas heat? What is the full make and model number on your furnace? Is there an LED flash code showing up on the furnace?