Header not moving right

When my site loads, the header with the site name and menu bar is fully visible, as it should be. As I scroll thru the first parallax image at the top, the header recedes up into the browser window title bar. Then as I continue scrolling down the page, the header comes sliding back down - but only halfway. And it stays that way on the rest of the page. How do I get the header to show completely on all of the page?

I’ve attached 3 screen captures. 1.png is the header just after the site loads. 2.png is after I scroll down the page just a bit. 3.png is after I scroll a bit more and how the header stays the rest of the page down.

Follow up: Seems to be only happening on Chrome on the Mac. Works fine on Safari & Firefox on the Mac and Chrome and Explorer on Windows. Didn’t test others yet. Guess there is a compatibility issue with Chrome Mac OS.

Hi there

Hope you are having a good day and thank you for your question
please provide url and i will take a look