Guild Wars 2

I was looking at some runes today and I noticed that the Sanctuary runes have something of an anomaly on the second stat.

Where every other rune set I checked maintains the same stats, just slightly better, as the tiers increase the Sanctuary runes do not. So where other sets go along the lines of:
+5% Burn Duration
+10% Burn Duration
+15% Burn Duration
the Sanctuary Runes go
+5% Boon Duration
+10% Boon Duration
+20% Frozen Duration.

Is this…intended? o.O

I was kind of dismayed to discover this when I went to buy a pair of them. Sure, my fault for not having double checked to make sure the Superior runes had the same stats as the minor and major.
But…that’s never been an issue, I can’t find any other rune sets that have a similar stat change from one tier to the next, they all just increment up with the same stat.

Is there a reason this one is so drastically different?

The other set that is like this is Rune of the Afflicted but that one might make sense for thieves, necromancers and maybe rangers.

this is a bug.

it is NOT intended.

please fix it.