DrawOrder is changed after cloning

[syx_lemans]

static void cloneLayout()
{
    Acad::ErrorStatus es;   
    AcDbDatabase *curDocDB =acdbHostApplicationServices()->workingDatabase();   
    AcApLayoutManager *layoutMngr =
    (AcApLayoutManager*)(acdbHostApplicationServices()->layoutManager());       
    curDocDB->setTilemode(Adesk::kFalse);   
    const ACHAR *actLayoutName = layoutMngr->findActiveTab();         
    ACHAR *cloneName = layoutMngr->getNextNewLayoutName();   
    AcDbLayout *psrc=layoutMngr->findLayoutNamed(actLayoutName, TRUE);    
    if (psrc== NULL)
    {       
        acutDelString(cloneName);      
        return;   
    }   
    es = layoutMngr->cloneLayout(pSrc, cloneName);   
    acutDelString(cloneName);   
    pSrc->close();   
    if (es == Acad::eOk)       
    layoutMngr->updateLayoutTabs();
}

I was tring to clone a layout to a new one. But I am suprised to find that all layers is copied but the order of some objects is changed.

old layerout:

new layerout:

Some objects above go behind