Jumping menu / Jumping and sliding unstable menu on Mobile

Hello

I have a new website, and I am having some problems with my menu when I view the page on mobile. The menu, when you scroll the page down, jumps, text somethimes slides and jumps.
I don´t know if the problem is because I have scroling text and images.

My website

Thank you for your help,
BR

Hello,

It looks like this code in your additional CSS is causing that (row 287-288):

.site-header.float-header {
	position: fixed !important;

Kind Regards, Roman.
aThemes Support