i am 98.75% sure that the little wad of thread at the seam start is something most/all machines do - at least if they have the top/bottom thread cut feature.
i don't think there's anything you can do about it.
that used to drop me batty because it's unattractive. then i realized two things:
1. it's on the back where it won't be seen anyway; and
2. it secures the beginning of the seam. this comes in handy when using a machine that doesn't have a convenient lock-stitch feature.
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