Multiplying a product by its inverse

hello there, i need help to understand why when i calculate the inverse of matrix i get the result expected but when i multiply some matrix A by another matrix B, producing C and  multiplying C by the inverse of B i dont get A this my result


should be same as A

8.000000 -5.000000 9.000000 2.000000
7.275132 4.867725 6.396825 1.105820
0.010190 -1.393788 13.070253 6.152067
-6.335496 3.575747 2.881812 3.454903

====== A ======

8.000000 -5.000000 9.000000 2.000000
7.000000 5.000000 6.000000 1.000000
-6.000000 0.000000 9.000000 6.000000
-3.000000 0.000000 -9.000000 -4.000000

and i code in c , i have tried float, double and long double data type