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You need need the execution to happen only once during the frame. Declare checker and try this:

if (int >= 0 and int <= 500) then -- alu/j

checker <= '0'

load_logic <= '0';

store_logic <= '0';

branch_logic <= '0';

If checker = '0' then

wait for 20 ns; alu_logic <= '1';

wait for 20 ns; alu_logic <= '0'; checker <= '1';

end if;

Add checker to all cases in this way.

Here you're just using checker to get it to happen just once. If this doesn't solve it, then we will modify it to get it to work.