Calendar shows dates as a day out

I'm having some trouble setting up the picker with locale="en-gb". Using the exact code below in plunker (Chrome Version 69.0.3497.100 (Official Build) (64-bit)). As soon as I add the ngModel as a moment object; the calendar shows all dates as a day out. i.e. 21/10/2018 shows as Monday instead of Sunday.

https://plnkr.co/edit/Cl2tjXm5cZB8JjQnigZH?p=preview

<!doctype html>
<html lang="en" ng-app="myApp">

<head>
  <meta charset="utf-8">
  <title>Angular Moment Picker</title>

  <!-- scripts -->
  <script src="//ajax.googleapis.com/ajax/libs/angularjs/1.4.4/angular.min.js"></script>
  <script src="//cdnjs.cloudflare.com/ajax/libs/moment.js/2.10.6/moment-with-locales.js"></script>
  <script src="//cdn.rawgit.com/indrimuska/angular-moment-picker/master/dist/angular-moment-picker.min.js"></script>
  <link href="//cdn.rawgit.com/indrimuska/angular-moment-picker/master/dist/angular-moment-picker.min.css" rel="stylesheet">
  <script>
    var myApp = angular.module('myApp', ['moment-picker']);

    myApp.controller('ExampleCtrl', ['$scope', function($scope) {
      var vm = this;
      vm.fromDateString = "2018-10-08T15:45:22.234Z";
      vm.fromMoment = moment(vm.fromDateString);
    }]);
  </script>
</head>

<body>
  <div ng-controller="ExampleCtrl as ctrl2">
    <input moment-picker="ctrl2.fromDateString" ng-model="ctrl2.fromMoment" locale="en-gb" start-view="month" />
  </div>
</body>

</html>

indrimuska / angular-moment-picker

Calendar shows dates as a day out #276