on xbox when i level up a kingdom from 3 stars to 4, the total income dont change. I should have 4490 but its stuck at 4190. Once I noticed that, I leveled 2 more kingdoms from 3 to 4 stars and the total income remains blocked at 4190. But on the right, it display correctly the change for the specific kingdom (145 to 195).
edit: I have now exactly 6 kingdoms at 4 stars and Im missing 300 gold in the overall income total (4190 in place of 4490) So it seems that the 50 gold bonus for 4 stars kingdoms only apply/work when the kingdom reach 5 stars because I receive correctly the 50 gold bonus from my 5 stars kingdoms.