Question: Vector Magnitude

I noticed the other day that the magnitude ||v|| for vector v gives different results based on the library loaded. I have not heard of any reason in my studies for there to be a magnitude calculation that is different from the

m = sqrt(`x__1`^(2)+`x__2`^(2)+...+`x__n`^(2))

Which I've come to understand as the calculation for the length of a vector of size N.
Why does the VectorCalculus library calculate the correct ||v|| whereas LinearAlgebra seemingly returns the largest element?

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