Guild Wars 2

Since applying 4 major runes of divinity, my crit damage is going all over the place.

If I look at the hero menu, sometimes my crit damage is 5% and 5 min later it’s 54% or anything in between. I have looked everytime with the same traits (ele), skills and armour, without any fury etc.

Is this bugged, or am I doing something wrong?

Thanks in advance

Insufficient information.
Critical damage like other stats is affected by downscaling so WHERE you are is going to make a difference.