sorry to hear that - please let me know if you can have further details or can find a reliable way to replicate this bug and i'll have it patched right quick <3
from what I can tell, it only does it after the first time you lose or win, and i think it's keeping the previous cost underneath or it's pressing the button twice in the same moment. best I can do
I did eventually end up winning regardless, the fix to the bug is uninstall, reinstall. the way to beat the game is prioritize boosting one scorium as high as possible while getting energy and positive card draw from minecart and the creature