The CSS style for labels is set to "overflow:hidden", that means that if you have a very long label with no spaces at all, if it overflows the button width, it will be hidden. If you mouse over the button label, you will see a tooltip with the full label.

You can edit/modify /var/www/html/fop2/css/operator.css and make .extenbutton class wider, with a smaller font, etc.. that will give you more room for long labels. Or you can use spaces instead of dashes on that name, and you at least will see a partial name. For example:

label=0101 Devi Dara Gusfini

Best regards,