I was upgrading BIA to level 13 and there was about half an hour left (17 gems) so because I wanted to go to bed and get started upgrading another power, I paid the gems and it completed the upgrade, gave me worshippers and I got an ascension chest. I then opened the shrine to select the next power to upgrade and it was showing BIA still upgrading and requiring 17 gems to complete the upgrade. BUG! I closed the program and opened it again and all was good.
kind of this also happens sometimes when you uncurse an item in the forge. i did not pay attention if gems involved or not, but mostly i use gems there. after a while or when close/open all is fine.