Why progress bar is not equal 100 in swf animation if I use function gotoAndStop()???

I have animation problem is swf file when I use function gotoAndStop or gotoAndPlay

import krpano_as3_interface;
var krpano:krpano_as3_interface = null;
this.addEventListener(Event.ADDED_TO_STAGE, startplugin);
function startplugin(evt:Event):void
{
krpano = krpano_as3_interface.getInstance();
krpano.set("progress.showload","none");
krpano.set("progress.showwait","none");
addEventListener(Event.ENTER_FRAME, enterFrameHandler);
}

function enterFrameHandler(event:Event):void
{
if( krpano.get("progress.isloading") == true )
{
var progress:Number = Number( krpano.get("progress.progress") );
krpano.trace(0,Math.round(progress*100));
//I have 100 frames
gotoAndStop(Math.round(progress*100));
}
}

If I turn off funct gotoAndStop then krpano.trace output range progress 0..100
If I turn on funct gotoAndStop then krpano.trace output range progress 0..83

Why when I turn on function gotoAndStop() progress is not equal 100?????