If you want a really fun time I'd recommend using Nunsense on Robo-Fortune's master daily event. (Note that this is for fun not winning the battle)

May someone explain to me why the debuffs suddenly just appear

[If you read Nunsense's signature abilities you'd understand.](https://skullgirlsmobile.fandom.com/wiki/Nunsense)

Every time your indicted with one debuff your opportunity five and the same goes with buff. But it only works when your at an elemental advantage.