I created a simple Back Office datatype with a js controller, resource,html, manifest and c# controller but the ng-repeat fires twice.

html:

  <div ng-controller="My.custom02">
        <div ng-repeat="person in people" >
                <p>First Name: {{person.fname}} {{people.length}}</p>
        </div>
  </div>

js controller:

custom02.GetAllData().then(function (response) {
   $scope.people = response.data;
})

js resource

angular.module('umbraco.resources').factory('custom02', function ($http) {
return {
    GetAllData: function () {
        return $http.get("backoffice/Dignity/BackOfficeApi/getName");
    }
}

})

The BackOfficeApi/getName just returns a simple string ("John")

The response.data contains the correct data ("John") and the same goes for $scope.people but the ng-repeat indicates the people.length is 4.

One suggestion I have seen is that the angular library is being called multiple times but not sure if that is the case.

I have created similar in previous Umbraco versions so wondering if it is something to do with V8.