Hi I’m level 28 and I unlocked the forge(your meant to upgrade it at level 30).
I clicked the free chest icon the forge was showing once i opened it and clicked back I saw what I think is the upgrade screen and didn’t know what to do so I clicked upgrade, which I didn’t want to do ‘cause I was saving gold for an island and now I’ve got it under leveled. I can’t show you the picture because apparently it’s forbidden but just believe me... here is the remains of the picture

@xTurtlesDoGaming
Same thing here I'm lvl 26