I noticed that team power snapshotted in Arena is different from the newly-calculated one after update 2.0.10-A.
All game servers will be down briefly at 9:56 AM CT on June 10 to fix an issue with the hero power changes from update 2.0.10-A .
I compared two team power values using the exactly same heroes including their level, equipment, and so on (i set up Arena defence using only Wrech-it-Ralph heroes 3hours before server update because current weekly challenge The Bigger They Are… may become easier for players).
Team power snapshotted in Arena is 110,003. On the other hand, team power shown in campaign fight is 134,191.
Does the difference affect the weekly challenge, @Polaris?