I cannot upgrade hatchery beyond level 3. There is no upgrade button. My friends can. This is very unfair, please fix it asap. Otherwise I will be competing in heroic races against people with 5 slots in their hatchery.
Many people seem to have this problem.
Here are pictures of my hatchery at level 3 and no upgrade button, and picture of my friend's at level 4 with upgrade button. 1_1553044083730_0969B5A5-18C6-4D05-ADC5-EA44FD254727.jpeg 0_1553044083729_953BC0A4-C515-4803-9392-96F4FF8A4803.jpeg