There is a bug with the challenge woth the population and the void gatherers when you exceed the population amount after you got the challenge it goes back to not being fulfilled.
Man here in europe it has been over 8 hours and more,
With that timehole i cant get my daily sign in and stuff nevermind i cant PLAY THIS SHT BECAUSE OF FCKNG HOURS FOR A FLASHGAME MAINTENANCE
It's they way it's designed to be. Challenges aren't persistent you can lose them if the conditions vary