Hi,
You are not missing anything. Most probably the label length is overflowing the button width, and the css style sets text to be hidden when overflow. You can mouse over the label and a tooltip with the full name will appear after a short while.
You can edit operator.css too, and set buttons to be wider, look for the .extenbutton class specifically in /var/www/html/fop2/css/operator.css
Best regards,
