I couldn't find any post related to this issue so I apologize if an answer was already given.
My problem is that some characters in my char selection screen are too big and I started asking myself if it was a problem with my resolution or it was simply related to the game version.
Here you can check a screen:
I just tried on my laptop 1366x768 and it was the same both windowed and full screen as you can see in your char screen. Changing to different screen ratio (4:3 or so) - for example 1024x768 makes the char size look normal. I suppose it is how the game behaves on 16:9 in this version.