Coconut cupcakes

I don't know why these cupcakes fell but I will give 2nd try and see if they hold up better. They were delicious though.

Wet ingredients
1/2 cups coconut milk ( I used the thick Thai version)
1/2 cups sugar (makes a sweet cake, can be reduced)
1/2 tablespoons apple cider or white vinegar
1/2 teaspoon coconut flavoring (hard to find. Most commercially sold is imitation)
1/4 cup coconut oil

Dry ingredients
3/4 cups cake flour
1/2 teaspoons baking powder
1/4 teaspoon baking soda
1/8 teaspoon salt

Beat milk and sugar and then add oil. Mix coconut flavoring and vinegar. Set aside

Sift dry ingredients and slowly add to wet ingredients. Bake for 20 minutes for cupcakes.