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The thread bunching up on the top side can actually be caused by incorrect tension on the bottom side.
So try adjusting the bottom side tensioner and let me know if that helps.
Also ensure the moving parts are clean, and any buildup of lint, etc. has been removed.
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It looks like the upper thread may not be threaded correctly. If the upper thread is incorrectly threaded, the upper thread passed through the fabric cannot be firmly pulled up and the upper thread becomes tangled in the bobbin case.
To fix this, see the following guide: