React Router not changing sub page - reactjs

Question

In my App.js i have a navbar and a router switch that takes me to admin page
<Router>
<Navbar />
<Switch>
<Route exact path='/' component={Welcome} />
<AdminRoute path='/admin' component={Admin} />
My Admin component have a sub router as follows:
<Router>
<SubNav />
<Switch>
<Route exact path={`${match.path}/planners`} component={Planners} />
<Route exact path={`${match.path}/`} component = {Admin}>
</Switch>
</Router>
If i go to www.mysite/admin everything works fine and my SubNav links work fine. My issue is the my Navbar has links such as
<Typography
to='/admin/planners'
component={Link}
>
Planners
</Typography>
<Typography
to='/admin'
component={Link}
>
Admin
</Typography>
The moment i route to a subpage the Navbar links stop changing the subpages although they are changing the URL just fine. Linking from the Navbar at first time works then if i try clicking on Admin it does not route to / again.

Answer 1

I solved this by removing the <Switch> and removing the <Router> from the Admin component. <Route> alone without wrapping it with a <Router> was sufficient
Below is a code that explains the behavior
import React from 'react';
import { BrowserRouter as Router, Route, Link } from 'react-router-dom';
function Resource1({ match }) {
return (
<div>
<h3>Resource1</h3>
<p>Resource1 Descriotion</p>
</div>
);
}
function Resource2({ match }) {
return (
<div>
<h3>Resource2</h3>
<p>Resource2 Descriotion</p>
</div>
);
}
function Topic1({ match }) {
return (
<div>
<h2>Topic1</h2>
<p>Topic1 Description</p>
<ul>
<li>
<Link to={`${match.url}/resource1`}>Resource 1</Link>
</li>
<li>
<Link to={`${match.url}/resource2`}>Resource 2</Link>
</li>
</ul>
<hr />
<Route path={`${match.path}/resource1`} component={Resource1} />
<Route path={`${match.path}/resource2`} component={Resource2} />
</div>
);
}
function Topic2({ match }) {
return (
<div>
<h2>Topic2</h2>
<p>Topic2 Description</p>
<ul>
<li>
<Link to={`${match.url}/resource1`}>Resource 1</Link>
</li>
<li>
<Link to={`${match.url}/resource2`}>Resource 2</Link>
</li>
</ul>
<hr />
<Route path={`${match.path}/resource1`} component={Resource1} />
<Route path={`${match.path}/resource2`} component={Resource2} />
</div>
);
}
function Topics({ match }) {
return (
<div>
<h1>Topics</h1>
<ul>
<li>
<Link to={`${match.url}/topic1`}>Topic 1</Link>
</li>
<li>
<Link to={`${match.url}/topic2`}>Topic 2</Link>
</li>
</ul>
<hr />
<Route path={`${match.path}/topic1`} component={Topic1} />
<Route path={`${match.path}/topic2`} component={Topic2} />
</div>
);
}
function Home() {
return <h1>Home</h1>;
}
class App extends React.Component {
render() {
return (
<Router>
<div style={{ width: 1000, margin: '0 auto' }}>
<ul>
<li>
<Link to='/'>Home</Link>
</li>
<li>
<Link to='/topics'>Topics</Link>
</li>
<li>
<Link to='/topics/topic1/resource1'>Resource 1</Link>
</li>
</ul>
<hr />
<Route exact path='/' component={Home} />
<Route path='/topics' component={Topics} />
</div>
</Router>
);
}
}
export default App;