modelsim仿真错误，如何解决？

Question

求解
为什么测试给A,B所赋予的值，仿真的时候会变掉。
像测试代码中A=00000011；仿真的时候就为变为A=00001011;

Answer 1

修改后的代码：（答题不易，还请采纳！）

module MULT4B #(parameter s)(Y,A,B);
    input [s:1] A, B;
    output [2*5:1] Y;
    reg [2*5:1] Y;
    integer i;

    always @(A, B)
    begin
        Y = 0;
        for (i = 1; i <= s; i = i + 1)
        begin
            if (B[i])
            begin
                Y = Y + (A << (i-1));
            end
        end
    end
endmodule

module tb_MULT4B;
    reg [8:1] A;
    reg [8:1] B;
    wire [16:1] Y;

    MULT4B #(8) i1 (
        .A(A),
        .B(B),
        .Y(Y)
    );

    initial
    begin
        #0 A = 8'b00000000; B = 8'b00000000;
        #5 A = 8'b00000011; B = 8'b00110001;
        #5 A = 8'b01000010; B = 8'b00010000;
        #5 A = 8'b00000000; B = 8'b00000000;
        $display("Running testbench");
    end
endmodule