Admob - Cordova admob pro banner android position issue

I have tried to implement admob for both ios and android but it is not working on android. Ios is working perfectly fine.

if (window.AdMob ){

                var admobid = ( /(android)/i.test(navigator.userAgent) ) ? adMobHelper.getAndroid() : adMobHelper.getIos();
                AdMob = window.AdMob;

                AdMob.createBanner({
                        adId: admobid.banner,
                        adSize:AdMob.SMART_BANNER,
                        position:AdMob.AD_POSITION.BOTTOM_CENTER,
                        autoShow:true
                    },
                    function(){console.log("Success Ad");},
                    function(error){console.log("Error ad: "+error);}
                )
            }

For android, ad is showing up in the middle of the screen. I have tried on galaxy s3 and nexus 5, same behaviour on both devices.