The team is currently retesting all settings.
We want to make sure that we find what caused this, which means we will not rush a fix - since it is Friday, this means the correction of the keystone could be a few days off right now to ensure a better reaction time from us once we can employ a new fix. (So not before Monday.)
We will of course track the effect, and I will let all players with the hero know (also ingame), once this can be fixed.
Thanks again for reporting this.