I also have a problem with my colocasia jacks giant.
The edge of the leafs of the mother plant are dry and brown but i keep spray it with water but all new leafs have this strange problem , but the offsets dont have leafs with dry and brown edges the leafs are normal .
Also the mother plant makes tiny leafes and at the start it didnt even maked leafs. There were only the stem of the leaf but no leaf at the end.
Is this a kind of mutation of the plant. I got the tuber this year.