Listbox onDataChange

Classic Servoy
1

Hello All,

I have this Listbox with an onDataChange event attached,

function onDataChangeSectionLb($oldValue, $newValue, $event) {
	application.output($oldValue + ' - - ' + $newValue);
   return true;
}

When the onDataChanged is triggered from smartclient I get
68 - - 67
67 - - 68
68 - - 67

but when triggered from a webclient I see
67 - -

Is this expected behavior?
We use servoy 7.2

Regards,

Peter