Ionic data randomly don't display

I’m devloping an aplication on ionic using api when I go on a certain view the first time some data sometimes don’t display. however the data seem to have no problem to load.

here a screenshot of my problem :
enter image description here

controller.js :

.controller('activite', function($http,$state,settings,$scope,$rootScope,ActiFactory,EventFactory)


activite.html :

  <ion-content padding="true" class="has-header">
    <form class="list">
      <label class="item item-input">
        <span class="input-label">
          {{evenement_selectionne.lieu}}, {{}}. {{activite_selectionne.heure_activite}}.
    nombre d'inscrits : {{activite_selectionne.inscris.length}}/{{activite_selectionne.limit_particip_activ}}
    <button style="color:#FFFFFF;" ng-click="inscription()" class="button button-balanced  button-block icon-right ion-arrow-right-c">
      S'inscrire à cet évenement !
      <img src="{{activite_selectionne.image}}" style="display: block; width: 100%; height: auto; margin-left: auto; margin-right: auto;">

thank you in advance

is your service(Actifactory) returning/using a promise?

Sorry for the long time answer.

my service “Actifactory” just return the var “Actifactory” who contain “ActiFactory.evenement_selectionne” (data), “ActiFactory.activite_selectionne” (data) and ActiFactory.actiRequest (function).

I don’t understand totally the concept of promise, it’s seem not to be a asynchronous data loading problem because the data is well print in the console before be scoped.