Upgraded tavern on second turn, but it didn’t and cost increased
a screenshot would help alot to understand the situation
Can’t do it with my thrust level
https://sun1-97.userapi.com/zXfIieAqnu9tAhpS-aCbgpBXj-xxg0Ssuu2CcA/HVj-K1MAwmI.jpg
On Turn 1 you can only buy a minion. On turn 2, you upgraded from Tavern 1 to Tavern 2.