(Noob here) Doubling of AJAX calls

(Noob here) Doubling of AJAX calls

$('.popisZupanija').submit( function () {
       
                var upit = $(this).formSerialize();
   
               
                $.post('testing.php', upit );
               
                return false;
               
        });


Every time i press submit button there is twice as many calls ... 1, 2, 4, 8, 16, 32 .... if i press another button it resets to 1 ....

I am lost ... and i am pretty much clueless.

Help?