I mean just judging by your team my guess is there is no tuning at all. So my question for you is - why would you assume the damage should be the same?

I`m not saying damage need to be the same, but 4M is, i mean, big difference. When i attack Hard CB, than i do 5.50M to 6M damage by 1 key.

There are so many possible reasons it isn't really worth exploring. But most likely it's simply because someone died earlier in your first run, compared to your second. And that could be because the "wrong" person was targeted by the stun, or because a debuff wasn't resisted, or because a critical hit landed at a bad time, or etc etc etc.

Maybe so... Thanks!

Adding to Kram's explanation, this will be an especially prevalent issue in teams that aren't speed tuned which is pretty common early on in our account. Scyl is another wrinkle in that she'll be putting out speed boosts at random, which will affect our turn ordering. 

Affinity could also be another common issue. 

On my little referral account it varies from 20 million to 34 million per run, largely depending on affinity. Not having a proper speed tune really affects a CB comp.

Makes it hard to consistently hit top chest if I only wanna log in once or twice per day onto that thing. :D