Hi .
Sorry for my bad english .
My nations had about 18,400 working citizens , and 1909.99 infras . Today I bought 10 more infras , But after that , number of citizens decreased to 17,003 ! I bought more infras but problem not solved .
I attached 2 images . one of them shows that I have -1 available improvements slots . ( it's not true . no wars . no destroys )