I swear I posted something like this before but I can't seem to find it. Anyway it's reproducible now so here goes: When you have an upgrading Flame Gate, the Re-arm All cost: a) shows always even though all re-armable (not under construction) Flame Gates are fully armed b) shows as zero *grog* (as opposed to gold)
This bug continues to exist. It also exists for when Mines / Mystic Mines are upgrading, both from when they are selected and also when trying to re-arm from the Pirate Hall.