my guess would be that one or more of the artifacts has atk rather than atk% as their primary stat. gauntlets, chestplates, and boots can all increase attack (as well as hp and defense) by either a flat rate or a percentage and for this mission you need to make sure all of them are percentage based.

that's the most likely source of your issue, but if it turns out that it isn't then please upload screenshots of the champions and gear in question.

I think they are all flat rate. I didn't know the difference. So I will mess around and see if I can get it right with that. Thank you!

Ok I still couldn't get it to work. I've included screenshots. Hope it helps!

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So the boots have HP as the Primary Stat.

The gloves have DEF % as the Primary Stat.

The chestpiece has ATK as the Primary Stat.

I see all those pieces have ATK % as a substat, but you're lookiIng for ATK% as the Primary Stat, the main one. 

You're looking for pieces like this:

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I wouldn't spend too much resources on this at this time to be honest. 

Thank you so much for the screenshots! 

"Subtle" boasting again Q?

Subtle?  Sure. Straight up bragging.