Frequently I find circle centers wind up slightly off the origin but a tiny amount. e.g. 10**-16. I find that it is always the Y component that ends up off.
I was wondering if there is some reason that it would be the Y (and not X, Z) that move off the origin.
That’s just noise from the limitations of floating-point math on a computer. Why it seems to only appear in certain axes…well hard to say, but it is seriously nothing…which as a side note is why you shouldn’t set the scale of your models to have 16 significant digits, keep it to 6-8 max.