Checking 2 radio buttons (different lists) by default

Hello! I am currently taking my first steps in Ionic, so I apologise in advance.

In this example, I have 2 radio button lists (with options 1, 2, 3 and options 4, 5, 6):

I would like both radio buttons 2 and 4 to be checked by default.

Why is only radio button 4 checked?

What am I missing?

For all interested, I was missing a “name” property on each list.

Check here.