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We need more information to understand and resolve this issue. If the below steps in 'Fixing the problem' don't help you please contact support.
Despite logging in every day, you may not receive your daily login bonus of gold. It may appear as if you have received less gold than previously.
A completed daily login bonus with a 7 day streak.
Fixing the problem
The Gems of War team is looking into this issue.
In the mean time, your daily gold bonus amount can decrease if you have recently changed guilds. Avoid changing guilds if you don't want your daily login bonus to decrease. Additionally, the daily login will reset at 7 am GMT; try logging in before that time.
Note: You don't need to play a match to collect your daily login, only login to the game.