[GAMEPLAY] Elementalist lux bug - Able to select the same element

So i was playing a game with Elementalist Lux. After a fight, i died and killed the enemy Nami. That unlocked the next element for me. The problem is that i was able to select Nature element again even if i already had it.

Out of curiosity, i tried it and it transformed me to the water form. The game considered it as a "last form" since i wasn't able to gain elemental power again.

Anyone had this bug once ?