We're sorry to hear this, Jolanta! We wonder if the dough over-proofed which is often the cause of a loaf that is dense and gummy. If your starter is very active or if you're in a warmer, more humid location, these can speed up the rising process of your dough. We might suggest shortening the rise times a bit next time around to see if this helps. The times given in the article are a good guideline but it's helpful to go by how your dough looks and feels in addition to time. We hope this can help!

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