There are about three things that cause birdnesting: Unbalanced tension, flagging, or a problem with the hook assembly.

For tension problems, check the thread path to insure the machine is threaded properly and then sew a tension test such as a 18mm capital "I" test.

For flagging , be sure the fabric is framed tightly. Also, make sure there is not a significant gap between the hoop assembly and the sewing arm.

Third, if there is a problem with the hook assembly. Either the hook positioning finger is mounted too close to the hook basket, or the hook basket does not allow the sewing hook to spin freely

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