Actually there is one bug in spell timer, that exist for some time now. I think more than 7 months.
If you have skill, like Brawler's Tenacity (brawler end line in AA firs tree), it has 2-3 triggers of death safe. So in normal buffs window it shows correctly, counting down timer and amount of triggers. But in spell timer window, it always show it has 0 triggers left :/
You can see it on my screenshot -
http://postimg.org/image/5k8fxgrpr/
IIRC it affects more buffs with triggers.