LibGDX table bug?

Hello I’m trying to make a chatbox.
I have a problem, the problem is that when I add a string to the chatTable the label/string will get positioned in the middle.

what I use to add text/labels to the chatTable.

chatTable.add(username ": " + txtField.getText()).bottom().left();

More code

chatTable = new Table(GameClient.getInstance().getSkin());
chatTable.debug();
Table container = new Table(GameClient.getInstance().getSkin());
container.setBounds(81, 66, 313, 138);
container.debug();
ScrollPane scrollPane = new ScrollPane(chatTable, GameClient.getInstance().getSkin());
scrollPane.setFadeScrollBars(false);
scrollPane.setFillParent(true);
container.add(scrollPane).bottom().left().expand();
stage.addActor(container);

Please tell If I did something wrong or a more code must be posted.