Sticky navbar is bouncing - navbar

Question

http://testsites.wz.cz/
(function($) {
//SCROLL
var menu = $(".menu"),
menuLinks = menu.find("a");
menuLinks.on("click", function(event) {
$("html,body").animate({
scrollTop: $(this.hash).offset().top
}, 1000);
event.preventDefault();
});
//BACK-TO-TOP
var backToTop = $("<a>", {
href: "#cover",
class: "back-to-top",
html: '<i class="fa fa-caret-up fa-5x"></i>'
});
backToTop
.hide()
.appendTo("body")
.on("click", function() {
$("body").animate({
scrollTop: 0
});
event.preventDefault();
});
var win = $(window);
win.on("scroll", function() {
if (win.scrollTop() >= 600) backToTop.fadeIn();
else backToTop.fadeOut();
});
//STICKY MENU
$(document).on("scroll", function() {
if ($(document).scrollTop() > 0) {
$("nav").removeClass("large").addClass("small");
$(".decor").removeClass("large").addClass("small");
$(".logo").removeClass("large").addClass("small");
} else {
$("nav").removeClass("small").addClass("large");
$(".decor").removeClass("small").addClass("large");
$(".logo").removeClass("small").addClass("large");
}
});
})(jQuery);
Hi I´m new here :)
I found many tuts for sticky navbar it is good looking but it has one problem. It is bouncing while changing height(padding). When at home click other section. When at other sections click home. IDK where is problem.
THX.

Answer 1

It seems to be a jquery class change, take a look in your script.
Change
<nav class="navbar navbar-default navbar-fixed-top large">
To :
<nav class="navbar navbar-default navbar-fixed-top small">
Final answer, change this in your CSS :
nav.small li a {
padding: 25px 0;
transition: all 1s;
}
Another way :
nav.small:AFTER li a {
padding: 16px 0;
transition: all 1s;
}
nav.large:AFTER li a {
padding: 25px 0;
transition: all 1s;
}