I haven't changed anything in the upgrade cost calculation. I assume this was caused by one of the two short server downtimes yesterday caused by the Kong authentication services being down for a minute or so. I have to see why the client doesn't handle timeouts correctly.
I hope everything is normal again once you reloaded the game. Please create a bug report when this isn't the case.
 "Guardians of Dreamstate: Infinity Gem"){kind=icon}
 "Crafting Idle Clicker"){kind=icon}
 "Holyday City"){kind=icon}
I haven't changed anything in the upgrade cost calculation. I assume this was caused by one of the two short server downtimes yesterday caused by the Kong authentication services being down for a minute or so. I have to see why the client doesn't handle timeouts correctly. I hope everything is normal again once you reloaded the game. Please create a bug report when this isn't the case.