I’d say it’s just a function of the enemies having high Defense values. This is new content, meant to be a bit more challenging than older content.
But if you think there may be a bug, I’d suggest contacting Support and asking them to investigate their logs and whether the damage amounts are as expected. How to Contact Support (Version 31 Onwards)
As monster/boss Defense stats aren’t visible in the game, there’s no way for us to calculate what we’d expect the damage to be based on Damage Calculation
