Thank you for reporting this to us.
Over the past weeks, we’ve been implementing a feature that addresses the problem where some players would get too many rewards when they attack multiple titans in a short time period.
It seems that due to a bug, this feature was unfortunately triggered already in version 1.11. My apologies. This bug has now been fixed.
However, we are still planning to do the change in version 1.12. Basically, we don’t mind people helping other alliances, but we do mind people using it to get clearly more rewards than intended. The alternative would be to make titan rewards worse for everybody, and we don’t want to do that. The game will inform the affected players about the Loot Tier reduction in the Titan Hunt result view. Naturally, any players who stay in their alliances to fight the titans are not affected by these changes.