Different Base HP

[Izozkean]

Hey. My friend and I are both playing Yun Zen Archers, but I have significantly more HP than her. When we check, my base HP is 931, and hers is 614. Why would that be, when we're both the exact same level, with the exact same gear, and the exact same soul shield? I can't for the life of me figure it out.

[Grimoir]

Same unity level?

[Izozkean]

She hasn't levelled high enough to have a unity level, and I haven't started working on mine yet, so I don't have any.