Use absolute static path

classes/config.template

 define('API_KEYS', ['ANIDB' => 'AAAAAAAAAAAAAAAA']);
 
 // Allows you to run static content off another server. Default is usually what you want.
-define('STATIC_SERVER', 'static/');
+define('STATIC_SERVER', '/static/');
 
 // The hashing algorithm used for SRI
 define('INTEGRITY_ALGO', 'sha256');

classes/view.class.php

       $Styles = array_merge(['tooltipster'], explode(',', $CSSIncludes));
       foreach ($Scripts as $Script) {
         if (trim($Script) == '') { continue; }
-        header('Link: </'.STATIC_SERVER.'functions/'.$Script.'.js?v='.filemtime(SERVER_ROOT.'/static/functions/'.$Script.'.js').'>; rel=preload;', false);
+        header('Link: <'.STATIC_SERVER.'functions/'.$Script.'.js?v='.filemtime(SERVER_ROOT.STATIC_SERVER.'functions/'.$Script.'.js').'>; rel=preload;', false);
       }
-      header('Link: </'.STATIC_SERVER.'styles/global.css?v='.filemtime(SERVER_ROOT.'/static/styles/global.css').'>; rel=preload;', false);
+      header('Link: <'.STATIC_SERVER.'styles/global.css?v='.filemtime(SERVER_ROOT.STATIC_SERVER.'styles/global.css').'>; rel=preload;', false);
       foreach ($Styles as $Style) {
         if (trim($Style) == '') { continue; }
-        header('Link: </'.STATIC_SERVER.'styles/'.$Style.'/style.css?v='.filemtime(SERVER_ROOT.'/static/styles/'.$Style.'/style.css').'>; rel=preload;', false);
+        header('Link: <'.STATIC_SERVER.'styles/'.$Style.'/style.css?v='.filemtime(SERVER_ROOT.STATIC_SERVER.'styles/'.$Style.'/style.css').'>; rel=preload;', false);
       }
       require(SERVER_ROOT.'/design/privateheader.php');
     }