What should I do if the stitches are bunched together while sewing?

If the stitches are bunched together, lengthen the stitch length and continue sewing. Do not continue sewing without lengthening the stitch length, otherwise the needle may break and cause injury. Adjust the stitch length dial to increase the stitch length.

From the official Brother XH2149-001 Computerized Sewing Machine manual, page 1

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