Hi Lexi, we're not sure why your Cake Pan Cake had a weird taste/smell. Sometimes if you over bake a cake it can have an eggy aroma. Another possibility is if the oil you added was on the old side, it might have introduced a rancid flavor/aroma to the baked cake. It might also be worth trying fresh baking soda, since under active baking soda might not have neutralized the acidity of the vinegar completely. 

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