Thread winds under bobbin instead of on the bobbin.
Make sure the bobbin is seated all the way on the winding pin. There may be an adjustment for it--a technician can probably fix it for you. However, you can also try lifting the thread with a pencil tip just before it winds onto the bobbin. Some of my machines wind the thread unevenly (more on the bottom than the top of the bobbin) and I balance it out by lifting it when winding.
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