http://imagizer.imageshack.com/img538/3207/YxrXUL.jpg

If the button for more than two timers recovery, they do not display correctly overlapped.

I don't understand what you mean. What is a two timers recovery? When a spell has multiple charges? Also, does this also happens in the action bar?

Are you using any action bar mods?

Yes, that is what he means. As a mage for example, Supernova or Ice Nova will replicate this bug.
I'm using dominos as my action bar mod fyi.

This bug occured the moment 6.2 launched, and I've resorted to using blizzards default cooldown text until you/tuller find a way and/or decide to fix it.