Maintain header height + other problem

Here is the site:

https://redpinewebdesign.com/

Here is the code:

<header id="header" class="transparent-header dark header-size-custom" data-sticky-class="not-dark">
   <div id="header-wrap">
	<div class="container">
		<div class="header-row">

			<!-- Logo ============================================= -->
			<div id="logo">
				<a href="index.html" class="standard-logo" data-dark-logo="img/logo/white-logo.png"><img src="img/logo/color-logo.png" alt="Red Pine Logo"></a>
				<a href="index.html" class="retina-logo" data-dark-logo="img/logo/white-logo.png"><img src="img/logo/color-logo.png" alt="Red Pine Logo"></a>
			</div>

			<div id="primary-menu-trigger">
				<svg class="svg-trigger" viewBox="0 0 100 100"><path d="m 30,33 h 40 c 3.722839,0 7.5,3.126468 7.5,8.578427 0,5.451959 -2.727029,8.421573 -7.5,8.421573 h -20"></path><path d="m 30,50 h 40"></path><path d="m 70,67 h -40 c 0,0 -7.5,-0.802118 -7.5,-8.365747 0,-7.563629 7.5,-8.634253 7.5,-8.634253 h 20"></path></svg>
			</div>

			<!-- Primary Navigation============================================= -->
			<nav class="primary-menu">

			     <ul class="menu-container">
				<li class="menu-item">
					<a class="menu-link" href="#content" data-scrollto="#content" data-offset="0"><div>About Us</div></a>
			        </li>
				<li class="menu-item">
					<a class="menu-link" href="#form-section" data-scrollto="#form-section" data-offset="0"><div>Contact Us</div></a>
				</li>

			    </ul>

			</nav><!-- #primary-menu end -->
		</div>
	</div>
   </div>
	<div class="header-wrap-clone"></div>
</header><!-- #header end -->

Problem 1:

I am using the header from rs-demo-hero-image.html.

On my site, when you lower the width of the page, the header height changes. I want it to stay the same height like in the example.

Problem 2:

Sometimes when you click the header icon, only About Us appears. I have no idea why this is happening and it almost seems random. If you play around with the width and the button for awhile, you'll probably see the problem. I've even had the entire header disappear.