I found a 404 request error in your plugin,It will request /wp-content/plugins/wpdiscuz/assets/third-party/wpdcookiejs/customcookie.js.I did not find this file in the corresponding directory.I wonder if the developer wrote the wrong code.
This will be fixed in the next version update.
In case if you want to fix it as soon as possible please follows the steps below to get it resolved:
1. Open the /wp-content/plugins/wpdiscuz/class.WpdiscuzCore.php file
2. Find the following line (1068 line):
wp_register_script('wpdiscuz-jquery-cookie', plugins_url(WPDISCUZ_DIR_NAME . '/assets/third-party/wpdcookiejs/customcookie.js'), array('jquery'), $this->version, true);
3. Replace with the following one:
wp_register_script('wpdiscuz-jquery-cookie', plugins_url(WPDISCUZ_DIR_NAME . '/assets/third-party/wpdccjs/wpdcc.js'), array('jquery'), $this->version, true);
Don't forget to delete all caches and press CTRL+F5(twice) on the frontend before checking.