Angular JS ng-click not responding only on iPad Portrait mode, working fine on Desktop

Question

I'm trying to test an app on iPad, where i found ng-click not working on ipad portrait mode. It is working as expected on desktop and ipad landscape mode.

Even on android phone same behaviour is seen. Working on landscape mode but not working on portrait mode.

here is my view :

 <div ng-controller="ModelForecastController as ModelForecast">
<div class="col-xs-12">

  <div class="row">
    <div class="col-xs-6">
      <div class="form-control-static">
        <strong>Last Updated:</strong> {{ModelForecast.demand.lastModified}}
      </div>
    </div>
    <div class="col-xs-6 text-right padding-bottom"
         ng-hide="ModelForecast.componentStatus.contentReadOnly ||
 !ModelForecast.keyGroup.validData || ModelForecast.componentStatus.saveLoading">
      <button class="btn btn-default"
              ng-click="ModelForecast.resetPage()">Reset</button>
      <button class="btn btn-primary"
              ng-disabled="form.$invalid"
              ng-click="ModelForecast.saveData()">Save</button>
    </div>
  </div>
</div>

my controller:

 var ModelForecastController =
  function( $log, $scope, $state, $modal, $rootScope,
            bandCalculateService, fetchPageDataService,
            pageBandRecalculateService, fusionChartsDataService,
            modelForecastService, globalConstant,
            optionListService, keyGroupService, Utility ) {
    var vm = this,

     vm.resetPage = function() {
      alert('reste Page');
      vm.componentStatus = angular.copy( componentFlag );
      vm.renderPage();
    };

     vm.saveData = function() {
      alert('save data 2');
      var dirtyBasket = {
        userGroup: keyGroupService.userGroupSelection.userGrp,
        dealer: keyGroupService.locationSelection.loc,
        productGroup: keyGroupService.productGroupSelection.id,
        model: keyGroupService.modelSelection.id,
        demandGroup: []
      };
      // -- do other stuffs -- //
    };

I'm using angular-touch and class is becoming ng-click-active when clicked on dektop and ipad(landscape mode). But class is not becoming ng-click-active when it is in portrait mode.

issue seems to be working only for this module as for other modules touch is working fine.

Angular - version - 1.3.8 Angular-touch version - 1.4.3