Need help with java swing GridBagConstraints

I’m trying to add two more radio buttons into Spark’s preferences Chat section (additional time formats). And two of them overlap, and i can’t figure out why. I’m reading in the internet, but most examples are using different gridbaglayout format than Spark and there are just huge and talk about all in general. I will have to invest a week to learn how they actually work. But i already have a solution and just need two buttons to add. Maybe someone can point me in the right direction. I suspect those radio buttons do not feet into some set boundaries.

Original code (Spark/ChatPreferencePanel.java at master · igniterealtime/Spark · GitHub line 117):

chatWindowPanel.add(showTimeBox, new GridBagConstraints(0, 0, 2, 1, 1.0, 1.0, GridBagConstraints.NORTHWEST, GridBagConstraints.NONE, new Insets(5, 5, 5, 5), 0, 0));
chatWindowPanel.add(format24, new GridBagConstraints(1, 0, 2, 1, 1.0, 1.0, GridBagConstraints.NORTHWEST, GridBagConstraints.NONE, new Insets(5, 5, 5, 5), 0, 0));
chatWindowPanel.add(format12, new GridBagConstraints(2, 0, 2, 1, 1.0, 1.0, GridBagConstraints.NORTHWEST, GridBagConstraints.NONE, new Insets(5, 5, 5, 5), 0, 0));

So it looks like:

[ ] Show time in chat window ( ) 24:00 ( ) 12:00 PM

I modify it to:

chatWindowPanel.add(showTimeBox, new GridBagConstraints(0, 0, 2, 1, 1.0, 1.0, GridBagConstraints.NORTHWEST, GridBagConstraints.NONE, new Insets(5, 5, 5, 5), 0, 0));
chatWindowPanel.add(format24, new GridBagConstraints(1, 0, 2, 1, 1.0, 1.0, GridBagConstraints.NORTHWEST, GridBagConstraints.NONE, new Insets(5, 5, 5, 5), 0, 0));
chatWindowPanel.add(format24s, new GridBagConstraints(2, 0, 2, 1, 1.0, 1.0, GridBagConstraints.NORTHWEST, GridBagConstraints.NONE, new Insets(5, 5, 5, 5), 0, 0));        chatWindowPanel.add(format12, new GridBagConstraints(3, 0, 2, 1, 1.0, 1.0, GridBagConstraints.NORTHWEST, GridBagConstraints.NONE, new Insets(5, 5, 5, 5), 0, 0));
chatWindowPanel.add(format12s, new GridBagConstraints(4, 0, 2, 1, 1.0, 1.0, GridBagConstraints.NORTHWEST, GridBagConstraints.NONE, new Insets(5, 5, 5, 5), 0, 0));

So it should look like:

[ ] Show time in chat window ( ) 24:00 ( ) 24:00:00 ( ) 12:00 PM ( ) 12:00:00 PM

But the second radio button is overlapping with the third one. As i said, i suspect i’m adding too much columns into layout, but i can’t figure out how to change that.