Looping on wrong (bottom) side of fabric is almost always insufficient tension of top thread.
The fabric appears to be multiple layers high density so it will take a higher than typical tension setting.
You can easily verify it is top thread looping on bottom by using a different color top thread. Using a different color top thread will also aid in setting the proper tension as you'll be able to see bottom thread eventually come to top side as you increase tension. Then reduce tension until stitch returns to center of fabric layer.
SOURCE: Stitch selection
Next to the "selection wheel" there's a large-ish "hole" with a screw at the bottom, use your screw driver to wind up the screw and you'll be able to use the 9 to 15:)
Testimonial: "Big thanks mate! :)"
SOURCE: Brother M948 sewing machine - Bottom stitch
Go to brother.com and download a manual for free. Also, try a metal #15 bobbin.
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