Maintenance for the week of July 27:
• [COMPLETE] NA megaservers for maintenance – July 27, 6:00AM EDT (10:00 UTC) - 11:00AM EDT (15:00 UTC)
• [COMPLETE] EU megaservers for maintenance – July 27, 10:00 UTC (6:00AM EDT) - 15:00 UTC (11:00AM EDT)
Did you check the actual damage against an enemy? The tooltip could just be wrong. Last time I checked, adding points into this passive did not decrease the damage per tick, and with additional ticks it ended up being more damage total.