PWM control problem

Hello guys.

I'm designing a circuit of sort,and the part of PWM is having issue,don't know why...

So I'll briefly describe my PWM specs;

a 4-bit Input named Value,

Input clock 50MHz,

a single bit output PWM_out,

Duty cycle is equal to 1/16 of input clock and

it changes when Value change.

like, Value = 0000, Duty Cycle=0%

Value = 0001,Duty Cycle=6.25%

Value = 0010,Duty Cycle=12.5%

Value = 0010,Duty Cycle=18.75%

.... etc

value changed,duty cycle increased by 6.25%

Here is my code and output doesn't seem correct;

Anyone offers any thoughts and suggests or even help me fix my cod,I would be very grateful.

module pwm_c(clk,value,PWM_out,counter);
	input clk;
	input [3:0] value;
	output PWM_out;
	reg PWM_out;
	
	output reg [3:0]counter;
	
	parameter rst=1;
	
	always@(posedge clk)
		begin
			if(!rst)
				counter <= 4'd0;
			else
				counter <= counter + 4'd1;
		end
		
	always@(counter or value)
		begin
			if(value == 4'd0)
				PWM_out = 1'b0;
			else if(value == 4'd1)
				PWM_out = (counter >=4'd1) ? 1'b0:1'b1;
			else if(value == 4'd2)
				PWM_out = (counter >=4'd2) ? 1'b0:1'b1;
			else if(value == 4'd3)
				PWM_out = (counter >= 4'd3) ? 1'b0:1'b1;
			else if(value == 4'd4)
				PWM_out = (counter >= 4'd4) ? 1'b0:1'b1;
			
			else if(value == 4'd5)
				PWM_out = (counter >= 4'd5) ? 1'b0:1'b1;
			else if(value == 4'd6)
				PWM_out = (counter >= 4'd6) ? 1'b0:1'b1;
			else if(value == 4'd7)
				PWM_out = (counter >= 4'd7) ? 1'b0:1'b1;
			else if(value == 4'd8)
				PWM_out = (counter >= 4'd8) ? 1'b0:1'b1;
				
				
			else if(value == 4'd9)
				PWM_out = (counter >= 4'd9) ? 1'b0:1'b1;
			else if(value == 4'd10)
				PWM_out = (counter >= 4'd10) ? 1'b0:1'b1;
			else if(value == 4'd11)
				PWM_out = (counter >= 4'd11) ? 1'b0:1'b1;
			else if(value == 4'd12)
				PWM_out = (counter >= 4'd12) ? 1'b0:1'b1;
				
			else if(value == 4'd13)
				PWM_out = (counter >= 4'd13) ? 1'b0:1'b1;
			else if(value == 4'd14)
				PWM_out = (counter >= 4'd14) ? 1'b0:1'b1;
			else if(value == 4'd15)
				PWM_out = (counter >= 4'd15) ? 1'b0:1'b1;
			
			
			else
				PWM_out = 1'b0;
		end
		
	endmodule
	

My initial wave simulation of this code;