So I found a weird interaction between Ember of Mercy and Ember of Empyrean. I don't think it's was intended to do the following.
So picking up a Firesprite gives you 2sec of restoration with Ember of Mercy.
A healing grenade gives 4sec of restoration.
Ember of Empyrean let's you extend both timers (2sec and 4sec) to a max of 12sec.
Now the issue I encountered - let's say we have two instances, one where I used a healing grenade and then got the 4sec timer to the max of 12sec and another instance where I got the 2sec timer from a firesprite to the max of 12sec.
If I now pick up a firesprite it resets the restoration timer to the initial value.
healing grenade: max 12sec -> gets reset to 4sec.
firesprite restorationL max12sec -> gets reset to 2sec.
Like I said, I don't think that's intentional. I hope this gets fixed/changed.
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The same can be found with Phoenix Dive, using it again when you already have Restoration will reset the timer.