Removed die(); as it might be messing with things.

var/www/loginCheck.php

@@ -18,19 +18,16 @@
                 $_SESSION["loginError"] = "";
                 // Move onto landing page
                 header("Location: /landingPage.html");
-                die();
             }else{
                 // No matching users found, send user error
                 $_SESSION["loginError"] = "Invalid Username or Password";
                 // Return to login page
                 header("Location: /login.php");
-                die();
             }
         }else{
             // Return to login page, as credentials were not captured
             $_SESSION["loginError"] = "Login credentials not found, please try again";
             header("Location: /login.php");
-            die();
         }
     }
     catch(PDOException $e){