Why these two variables definition in Matrices of two sheets are different?

I want to define some variables and align them, so i put them in one matrix just like attached picture.Now there is a problem:I can not remember which day I wrote dowm this in the sheet ,in where this kind of variables definition is valid and I can get the 2nd variable's value below the matrix.but today,in a new sheet when I do this again, it says the variable is not defined, so I cant get the 2nd variable's value below the matrix.whatever i do, this problem remains, but in the valid sheet it is always OK.Could anyone help me?

my MC is "Mathcad 15 F000"

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