Bug on Passive Skills?

I have a question about Passive Skills.

I have Magical Attack ll with level30, which gives me +2.80K increase in magic attack.

But on the other hand, I also have Magical Attack lll with the same level30, but this one only gives me +2.10K increase. This is lower than Magical Attack ll.

I thought lll was stronger than ll but it turned out to be opposite… Is it a bug?

My ID is here if needed

Winding Fall

Hi, thank you for letting us know. We’ll investigate this urgently!

Hi, I’ve confirmed that this is by design. Skill III is superior because it can be leveled up to LV 50. Here’s a screenshot of the maxed skill.

Thank you very much for your investigation. Noted on that!