Rage Hit detection - Warrior

When using a basic attack or some melee attacks, the game scores Rage points.

My observation is a problem/or intentional action by the DevTeam
when using the Leap Slam attack. If we use the Rolling Slam or Leap Slam attack and hit several enemies, the game will only score single hits (1 Rage per attack). If he attacks the same enemies with the Mace, we can hit several enemies and have, for example, 5 Rage points for one attack. In the case of attacks such as Rolling Slam or Leap Slam, the game does not count Rage points correctly.

These attacks consume mana, are designed to use the Melee Skill, and use physical damage.
What's the deal with calculating Rage points?