when i i zoom in or zoom out on map and select the area of map , map zoom level return to primitive zoom level !! why does that happen ?!

[mojtabadarzi]

<Mapir
   accessToken={'TOKEN'}
   minZoomLevel={6}
   maxZoomLevel={20}
   zoomLevel={13}
   showUserLocation={true}
   centerCoordinate={[this.state.markers[0].latitude,  
   this.state.markers[0].longitude]}
   onPress={e => this.addMarker(e.geometry.coordinates)}
   style={{ flex: 1 }}
   ref={ref => (this.map = ref)}
   pitchEnabled={false}
   >
   {mark}
</Mapir>