That's pretts cool ! I have a machine that does zigzag stitch and my edges look like a hot mess (idc, it's on the inside).
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Sounds like maybe that's a thread tension problem!
Also my guess and I tried to fix it, I got gigantic nests instead ! So I decided to live with weirdly bunched up edges, I really don't mind.
My only other idea is have you tried changing needles?
I can't remember if I ever did it for this purpose honestly, I will try specifically that next time !
It's very easy for needles to be worn out without even being noticed. The tip can be worn and become hook shaped, the needle itself can be bent without it being visible to the naked eye. Changing them proactively can be a good practice.
It could also need more presser foot tension. If the needle lifts the fabric as it withdraws, not enough top thread gets pulled, and the stitches bunch up.