Swift - 解散ViewController太远了

Question

当我点击模式弹出式ViewController中的取消按钮时，出于某种原因，它会转到navigation堆栈的最开头，而不是返回到viewController那个叫它。我做错了吗？

堆栈的根，调用ViewControllerA：

class RootViewController {
    let viewController = ViewControllerA(contact: selectedContact)
    self.navigationController!.pushViewController(viewController, animated: true)
}

ViewControllerA /调用模式：

let viewController = ViewControllerB()
let navigationController = UINavigationController(rootViewController: viewController)
self.present(navigationController, animated: true, completion: nil)

ViewControllerB /解除模态：

@objc func cancelButtonPressed() {
    self.dismiss(animated: true, completion: nil)
}