We are aware of a known issue that is currently affecting Players that have joined an Alliance who are currently battling a Rare Titan after the Rare Titan has spawned. The tooltip description for Reduced Loot states 'Rewards for more than one titan within 20 hours are reduced' whereas it should state that your loot has been reduced due to joining the Alliance after the Rare Titan has spawned.
Please note - this issue has not affected the Loot Tier you receive, simply the Tooltip.
A fix for this Tooltip issue will be released in Version 20.0.
Please accept our sincerest apologies for any confusion and inconveniences this may have caused.