Im trying to use a debouncer for my project but when i test it out and click on a key it send a pulse when i click down and when i release a button. How can i fix this?

Here’s the code:

library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
use IEEE.NUMERIC_STD.ALL;

entity PulseDeBounce is
    Port (
        clk : in STD_LOGIC;
        din : in STD_LOGIC;
        dout : out STD_LOGIC
    );
end PulseDeBounce;

architecture Behavioral of PulseDeBounce is
    constant CYCLES : integer := 250_000; -- number of clock cycles for debouncing
    signal stable_counter : integer := 0;
    signal prev_din : STD_LOGIC := '0';
    signal stable_din : STD_LOGIC := '0';
    signal pulse : STD_LOGIC := '0';
    signal pulse_gen : STD_LOGIC := '0';
begin
    process(clk)
    begin
        if rising_edge(clk) then
            if din = prev_din then
                if stable_counter < CYCLES then
                    stable_counter <= stable_counter + 1;
                end if;
            else
                stable_counter <= 0;
            end if;

            if stable_counter = CYCLES then
                if din /= stable_din then
                    stable_din <= din;
                    pulse_gen <= '1';
                else
                    pulse_gen <= '0';
                end if;
            else
                pulse_gen <= '0';
            end if;

            prev_din <= din;
        end if;
    end process;

    process(clk)
    begin
        if rising_edge(clk) then
            if pulse_gen = '1' then
                pulse <= '1';
            else
                pulse <= '0';
            end if;
        end if;
    end process;

    dout <= pulse;
end Behavioral;

I tried to increment/decrement the number of cycles but it does the same thing.