preventDefault not working in all browsers/devices

Question

I am using the sidr menu for a website. I added a simple function to toggle the hidden submenus. I don't know why but i am not able to get it work in all browsers. The first solution is working in Firefox, edge and Safari, but not in Chrome, the second Solution is working on Chrome but not Firefox....

$('.sidr ul li.sidr-class-page_item_has_children > a').on('click', function(e) {
  e.preventDefault();
  $(this).siblings('ul').slideToggle("slow");
});

$('.sidr ul li.sidr-class-page_item_has_children > a').click(function(e) {
  e.preventDefault();
  $(this).siblings('ul').slideToggle("slow");
});