... and the curse couldn't be broken yet.

We name it bolu kukus, it's a kind of cup cake in steam version with soft, light, and sweet taste. The truly steamed cup cake should form some 'petal' (usually 3 petals sometimes could be 4) on its top or should 'laugh out loud' marked that it successfully made.
If you can't make them 'laugh', then your bolu kukus doesn't pass general bolu kukus qualification. Try to make the other ones, and if they still curl up their mouth, you get "the curse of bolu kukus" then.
Don't worry cause you're not alone, I'm with you. At least until yesterday I still couldn't break that curse. See this picture of my bolu kukus below.
They're just 'grinned' instead of smile, not to mention laugh. I think I know what I did wrong with them, so will try again within this week. Please God, I beg You ...help me beat this curse .....