Hi Aviana,
When option of adding squares on raid frames is used and you choose "dispel", then you choose timer and wants it to be shown. The icon of dispellable spell is shown it is ok, but no timer inside the icon, even if the option of timer is chosen. But the timers are working on the "Debuffs" (not in the squares section, but in auras) if debuffs are enabled. Maybe you can fix it :) Thanks