I've noticed that Bless, when cast while currently active, will commonly reset the buff duration on the buff bar without actually refreshing the true duration of Bless's effects. Video provided. Take care to notice the timer when i hover over the active-effects section and watch my stats. I refresh Bless when the time says there are 30 seconds remaining and 30 seconds later my stats go away, but i'm told the buff is still active. On a side note, bless and strength potions do not stack either. I'm not sure if this is intended but thought i'd mention.