{{count}} not updating in template view

I have a simple page as shown below.

The problem is that, even though $scope.objRef.count is updated in my directive (for example, from 7 to 8), the template shows the old value, 7, in the webview.

This happens when I switch to this state/directive/template:

How can this be? (in state tabs-page.tpl.html):

<ion-view view-title="{{objRef.count}}">
  <ion-content>
  </ion-content>
  <ba-tabs-page></ba-tabs-page>
</ion-view>

could you share the code of your directive?