Why can't the MSE of lasso() match the theoretical value?

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SC 2019-2-10
Hi,
I have below MSE1 and MSE2, which I got 13.27 and 5.87. Why don't they match?
clear
%set seed
rng(123);
X=10*rand([30,5]);
y=10*rand([30,1]);
[B,fitinfo]=lasso(X,y,'lambda',0);
MSE1=norm(y-X*B-ones([30,1])*fitinfo.Intercept)
MSE2=fitinfo.MSE
Thanks!

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