In order to have a consistent and simple notation for N-way PARAFAC, Tucker and N-PLS a special format is used for the factors. The cell Factors (or the name you have used) contains all loading matrices (A, B, and C) as

Factors = {A;B;C};

In order to convert to standard format use the m-file fac2let as

[A,B,C] = fac2let(Factors);

or simply extract the one you need as e.g.

B = Factors{2};