Looks like a bug with Sprite Font indeed
If you have an angled Sprite Font object near the right of the layout, it will get cut
In the editor:
[attachment=1:2ft5lh9k][/attachment:2ft5lh9k]
In the browser:
[attachment=0:2ft5lh9k][/attachment:2ft5lh9k]
I'll make a bug post about it