Possibly the voltage changeover switch is damaged. Or you are using a 220 volt power lead and a 220 volt outlet (they do exist) or the house wiring needs checking.
You can get 220v outlets in US houses - put simply the power coming in has 3 wires
Hot ------- 110 v
Neutral ------- 0 v
Hot ------- 110 v
From the middle (neutral) wire to either hot wire you get the normal 110 volts for lights, wall outlets etc but between the two hot wires is double that (220 volts) for large appliances like stoves, air conditioners, some clothes dryers etc.
The US standard is 120 volts / 240 volts but in fact you may see anything from about 107 to slightly over 120 on the hots depending on distance from the transformer feeding your house or group of houses.
One type of US 220 volt outlet
READ THIS
Another possibility is a fault in the house wiring that has led to a 110 volt outlet getting 220 volts (sometimes the middle wire becomes disconnected somewhere, on the power pole or inside the house) but you would know this because any 110 volt appliance plugged into that outlet would go BANG and if the whole house was affected you would surely know. Anyhow if there is a fault this is dangerous and you should get an electrician to check your wiring out. If you are aware of a problem in your wiring and you do not get it fixed this could void your fire insurance, and if anybody got injured or killed you could get prosecuted.