Zoom and center marker on click in leaflet

Instead of using setZoom and panTo, you can use single method setViewwith zoomoption.

map.on('popupopen', function(centerMarker) {
        var cM = map.project(centerMarker.popup._latlng);
        cM.y -= centerMarker.popup._container.clientHeight/2
        map.setView(map.unproject(cM),16, {animate: true});
    });