Cannot select data with prepared statement

I'm coding a searchable item database for a game that I play. I'm using prepared statements to pull data from the database to protect from injection but I cannot get the results from the database. I'm trying to use LIKE so it returns items when when partially typed but have had issues with the wildcards and variables so I am just trying to get it to work in general first. I've used almost exact code on another part of my site which works fine so I know it has to be something simple but i've looked over it numerous times and cannot seem to figure it out. Any help is greatly appreciated.

require 'dbh.php';

//View entire database
if ($_GET['search'] == view_all) {
  $sql = "SELECT * FROM itemdb";
  if (!$result = mysqli_query($conn, $sql)) {
    header("Location: viewresults.php?error=sqlerror1");
    exit();
  } else {
    while ($row = mysqli_fetch_assoc($result)) {
      include("item_template.php");
    }
  }
} else if (isset($_GET['search_button'])) {
  $searchname = $_GET['search_name'];
  $searchparam = $_GET['searchBy'];
  $searchorder = $_GET['order'];

  if ($searchname == NULL) {
    echo 'You must enter something to search for!';
  } else {
    $sql = "SELECT * FROM itemdb WHERE name = ?";
    $stmt = mysqli_stmt_init($conn);
    if (!mysqli_stmt_prepare($stmt, $sql)) {
      header("Location: viewresults.php?error=sqlerror2");

      exit();
    } else {
      mysqli_stmt_bind_param($stmt, "s", $searchparam);
      mysqli_stmt_execute($stmt);
      mysqli_store_result($stmt);
      $resultcheck = mysqli_stmt_num_rows($stmt);
      echo $resultcheck;
      if ($resultcheck == 0) {
        echo 'No results found! Try again! '.$resultcheck;
      } else {
        $result = mysqli_stmt_get_result($stmt);
        echo "success";
        while ($row = mysqli_fetch_assoc($result)) {
          include("item_template.php");
          echo "SUCCESS";
        }
      }
    }
  }
}