I was in the goblin box explorable when it either:
1. instant cast lightning bolt at me 2x
or
2. The lightning bolt cast hit me 2x.
https://imgur.com/a/MhTkFbw
As you can see it was instant 2 reflex saves followed by 2 instances of damage.
Instead of 1 reflex 1 damage + 1 reflex 1 damage.
And you are sure it was not one with more than one of those boxes?
It was just the one box yes.
The others shoot shadow stuff and I made myself immune to those.
According to main its a vanilla lightningbolt issue where it sometimes hits 2x if it hits you just right while moving.