Chocolate cupcakes again and again

In consecutively 2 days on 20/01/2012, Friday night and 21/01/2012, Saturday night, I baked the chocolate cupcakes again! This time I baked using 2 layers with a total of 24 cupcakes at the same time. OH MY GOD! My top layer cupcakes went bursting on the crust due to the sudden high temperature when I was not looking. It went up to 205 degrees! Oh my god, what happen? I was totally clueless. I tried the again the next day, the same thing happened. I was quite sure I should be using the traditional convection mode, am I wrong? I thought fan should not be used in baking of cakes, so I stayed at the convection mode. The cupcakes had gone lop-sided due to the high heat from the top heating element. Luckily the cupcakes at the bottom layer were doing fine. So I dust some icing sugar on the nicer ones and fill the uglier ones with strawberry cream cheese. Now... to the kids, who cares, as long as they were chocolate, who won't says yummy. Haha.