ByRow function produces two different results depending on whether row is range or array

Thanks for the detailed explanation and the solution, Sergei.

I am still trying to process your explanation fully. But after reading your explanation to mtarler and his work around with row function, I think I am getting some sense of the problem.

I am wondering if ByRow is treating the sequence as matrix instead of a vector when we directly pass it in the function (and therefore the array or array problem).

Am I going in the right direction?