You may not have the bobbin case seated properly in the bobbin well. Make sure the flat edges go underneath the metal flanges that are there to hold it in. I'm attaching photos of a similar problem I answered earlier that might help you understand how it goes in.
Below are the directions I sent with the photos...I hope this helps you! Good luck!
"This type of case can be a pain. First in photo 1, on the silver flange marked in a red circle there is a rectangular hole marked with a green circle. using a flat head screwdriver, insert into the rectangle and turn to the right. This should move the flange tongue marked with a blue circle towards the back white wall of the bobbing well. In Photo 2 take the black bobbin case and place in the bobbin well area marked with the pink spiral. Tilt the case slightly to insert the flat tongue marked with an orange X on the black bobbin case under the flange marked with an orange X in the bobbin well. Now let the black bobbin case sit in the bobbin well marked with the pink spiral. Now in Photo 3, you want to turn the black bobbin case to the right so the flat tongue marked with the orange X will go underneath the flange marked with an orange X. The other flat area marked with a purple X on the black bobbin case should line up with the purple X in the bobbin well. Once the black bobbin case is seated in, repeat the steps from Photo 1 in reverse to get the silver flange back over the bobbin case to hold it in place. I hope you can understand my directions and I hope this helps! Good Luck!"
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