When the bobbin stitching is off the problem is usually with the top thread. Unthread and rethread the machine making sure it is threaded correctly and is securely in the tension disk. If you still have trouble try using a new needle.
Remove the top thread from the machine.
ALWAYS RAISE the presser foot and rethread the top thread.
SOURCE: bobbin tension
This is an issue of your upper thread tension, so take a look at this generic tension solution
If you are in a pickle with your bobbin case, check top tension and bobbin case are free of lint, reset the top tension to 4, and adjust the bobbin tension to suit......some more detail on how to do that, is here
Bargain Box
SOURCE: Loose stitching underneath. HOW CAN I FIX!!!!
Sounds as though you may have a burr or rough spot on the hook where the bobbin inserts. Run your finger along the edge of the hook to see if there are any rough spots.I'm sure you're going to find at least one from the time you broke the needle.Once you locate it, remove it with an emery stick or small sharpening stone. Polish it so that it is smooth. Should work okay.
sewman7
SOURCE: Bottom stitches loose
You don't want to adjust the bobbin tension, you'll want to try adjusting your stitch length, as well as the regulator tension.
SOURCE: Juki HZL-E61: cannot get tension right on straight stitch
Loops on the bottom of the fabric direct the problem to the top thread. Rethread again and make sure the thread goes through the tension discs. Lift the foot, because this is what opens the discs. When sewing and the foot is down, the discs should be closed and thus giving the upper thread the tension it needs.
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