This issue has been marked multiple times now as a known issue. The issue is not a bug, but a flaw/oversight with the Daily Deals system with kingdom Power levels over 20 in its current implementation.
Given that the issue hasn’t been fixed yet, it likely requires a client update to fix and that means 5.3. And as 5.3 has not yet reached public beta yet, it is going to be a while before this issue gets fixed.