Guild Wars 2

I just ran 3 events in Cursed Shore that each gave me 378 Karma while under the effect of a Karma booster. The wiki says that the normal reward for these events is 378 Karma.

Is it broken? Am I missing something?

Did you look at what the karma reward was next to the Gold medal, or what the karma reward was at the bottom right of the screen? The boosted karma amount only shows at the bottom.

The numbers displayed on event completion are always without boosters.

The Gold medal plate show normal karma, bottom right where loot pops up and karma also shows real value. You should get more there.