I made chocolate frog cookies and they melted when they were in room temperature?!

Question: I made this recipe that my sister used to make for christmas every year:

Frogs

1 cup cocoa
4 cups sugar
1 cup milk
1 cup margarine
2 tsp vanilla extract
2 cups coconut
6 cups oatmeal

Mix cocoa, sugar, milk and margarine in large pot. Boil 5 minutes and remove from heat. Add vanilla extract. Stir in coconut and oatmeal. Combine well. Drop onto wax paper lined cookie sheets. Refrigerate 1 hour.

However, when I took them out of refrigeration, they melted when they warmed up to room temperature. What did I do wrong?

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Answers: I made this recipe that my sister used to make for christmas every year:

Frogs

1 cup cocoa
4 cups sugar
1 cup milk
1 cup margarine
2 tsp vanilla extract
2 cups coconut
6 cups oatmeal

Mix cocoa, sugar, milk and margarine in large pot. Boil 5 minutes and remove from heat. Add vanilla extract. Stir in coconut and oatmeal. Combine well. Drop onto wax paper lined cookie sheets. Refrigerate 1 hour.

However, when I took them out of refrigeration, they melted when they warmed up to room temperature. What did I do wrong?

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use butter in place of margarine

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