Your SSI should only be your navbar code and not the entire document.
Your dashboard page currently shows 2 of everything, 2 heads, 2 bodys, and 2 html tags. So I assume your navbar ssi has the entire head included in it too.
Is this project node, or php/mysql, or ASP
Edit: Just checked it’s PHP, so ignore that part.
Here are the docs of how to make an SSI
But basically your SSI should only have your nav code inside it, as well as a Wappler generated comment above it that tells wappler what components link to it.
<nav class="navbar navbar-expand-lg justify-content-between fixed-top bg-light style1 navbar-dark">
<a class="navbar-brand mr-auto ml-auto" href="#">PERNETAPP.COM</a>
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbar1_collapse" aria-controls="navbar1_collapse" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse justify-content-center" id="navbar1_collapse">
<div class="navbar-nav">
<a class="nav-item nav-link active" href="#">Home</a>
<a class="nav-item nav-link" href="#">About</a>
<a class="nav-item nav-link" href="#">Contact</a>
</div>
</div>
<div class="navbar-nav justify-content-end d-none d-lg-flex ml-md-auto">
<a class="nav-item nav-link" href="#" dmx-on:click="browser1.goto('login.php')"><i class="fa fa-user fa-2x"></i></a>
<a class="nav-item nav-link" href="#"><i class="fa fa-twitter"></i></a>
<a class="nav-item nav-link" href="#"><i class="fa fa-facebook"></i></a>
</div>
</nav>
On every page that you add the navbar SSI to, you should then make sure to include the correct head components
In your case it would need the browser component and bootstrap4 navigation component.