generated "unvaforable zero" value from multiplying two matrices, how to solve/correct it?

for simplicity, i have a two matrices A and B generated by matlab like below. when i calculated manually by excel with the function mmult(A;B) the value of C is vaforable like this. even when i increasing the decimal. especially the value of cell matrix C at 3,1 it was definetly zero

but when i multiply them in matlab i got value of C like this

how to deal with this type of problem? any guidance will help me alot, because i got bunch of wild value zero like this :( thanks a lott.

the following attachments is my full code, matrix A is k_sup and matrix B is uaa, and matrix C is Fsupt in my line code. input3Dxlsx is my input.

P.S

i tried calculate separately with new script (like the following A*B bottom), copy those matrices from generated excel (so the value is accurate), and the generated value of matrix C is entirely different, like this:

here is the following matrix A and B i copy from generated excel

A = [-3710000000	0	0	0	0	0;
    0	-12624305.56	0	0	0	75745833.33;
    0	0	-2318750	0	-13912500	0;
    0	0	0	-69358333.33	0	0;
    0	0	13912500	0	55650000	0;
    0	-75745833.33	0	0	0	302983333.3]

A = 6×6

1.0e+09 * -3.7100 0 0 0 0 0 0 -0.0126 0 0 0 0.0757 0 0 -0.0023 0 -0.0139 0 0 0 0 -0.0694 0 0 0 0 0.0139 0 0.0556 0 0 -0.0757 0 0 0 0.3030

B = [0
    0
    -0.025876011
    0
    0.004312668
    0]

B = 6×1

0 0 -0.0259 0 0.0043 0

C = A*B

C = 6×1

1.0e+05 * 0 0 0.0000 0 -1.2000 0