use PendingIntent.FLAG_UPDATE_CURRENT in calls to PendingIntent.getActivity() to avoid re-using the same extra data on every intent.

src/org/thoughtcrime/securesms/notifications/NotificationItem.java

@@ -77,7 +77,7 @@ public class NotificationItem {
 
     intent.setData((Uri.parse("custom://"+System.currentTimeMillis())));
 
-    return PendingIntent.getActivity(context, 0, intent, 0);
+    return PendingIntent.getActivity(context, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);
   }
 
 }

src/org/thoughtcrime/securesms/notifications/NotificationState.java

@@ -62,6 +62,6 @@ public class NotificationState {
     Log.w("NotificationState", "Pending array off intent length: " +
         intent.getLongArrayExtra("thread_ids").length);
 
-    return PendingIntent.getBroadcast(context, 0, intent, 0);
+    return PendingIntent.getBroadcast(context, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);
   }
 }