Hi Rosemarie, I'm sorry for the delay in responding to your question! Most sourdough starter recipes don't begin with yeast, let alone 2 1/4 teaspoons of yeast! Such a mixture would definitely cause a quart-sized jar to overflow when left at room temperature, so I don't think you did anything wrong. You might want to consider trying our sourdough starter recipe, as an alternative, since this recipe doesn't sound correct to me. For more information on creating a starter, check out our Sourdough Baking Guide. 

Barb

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