If you mean that the aircraft arrow is pointing in the wrong direction relative to the north arrow, then the aircraft compass is most likely suffering from local magnetic interference or, less likely, needs to be calibrated. Do not take off.
If the direction is correct relative to north, but the entire map is oriented wrongly relative to the direction that you are facing then that's a problem with the app and and the compass on your mobile device. That's a relatively common problem that doesn't negatively affect flying.