Guild Wars 2

Hi there, hoping someone has some info on this bug (at last it looks like a bug)

I just bought all three recipes for the runes of tormenting, minor, major and superior.
I made 2 of the minor ones to put on a lowbie mesmer and it tells me that they can’t be used below level 60. Then I checked the Major rune of tormenting and it’s the same, level 60 instead of 39.
Has anyone else noticed this? (i checked through 15 pages of bug reports but couldn’t see one relating to this).

It may be because unlike all other runes, these runes list the exact same benefits as the first lines of the superior runes with no scale back due to runs rarity.
For instance 2 minor runes still state they improve torment duration by 15% just like two superior runes do.