I have solved! in the avia.js line 791:

if(container.length)
                        {
                            var usersviewportWidth = $(window).width();
                            if(usersviewportWidth > 767 ){
                                var myOffset = 150;
                            } else {
                                var myOffset = 0;
                            }
                            var cur_offset = the_win.scrollTop(),
                                container_offset = container.offset().top,
                                target =  container_offset - fixedMainPadding + myOffset,

The myOffet variable must set with specific pixel height, in most case 150px.

Hello i have removed the logo with this css code:
.av-logo-container {display: none;}
But when Header menu link is pressed es: `Sez1“, the scrolling of the page not point in the correct position, because the real Height for the section remain the same.
You can riproduce the same behvoir whit this steps;

1. Select header with logo on top and menu bottom
2. create an homepage
3. add “color section element” in home page with id=sez1
4. in menu create link Sez1
5. hide logo with the css code
6. click the link in homepage

Now the problem is showed!!