Try setting the basename

src/App.tsx

@@ -5,7 +5,7 @@ import { BrowserRouter as Router, Route } from 'react-router-dom'
 
 const App: React.FC = () => {
   return (
-    <Router>
+    <Router basename={process.env.NODE_ENV !== 'development' ? '%PUBLIC_URL%' : ''}>
       <div className="App">
         <Route path="/:selectedClass?/:pointString?" component={IndexRoute} />
       </div>