diff --git a/syntax/image.php b/syntax/image.php
index d0180cf..d7f29f7 100644
--- a/syntax/image.php
+++ b/syntax/image.php
@@ -252,8 +252,9 @@ class syntax_plugin_luxtools_image extends SyntaxPlugin
             $outerStyle = ' style="width: ' . ($width + 10) . 'px;"';
         }
 
-        // Use thumbnail metadata from helper
-        $dataThumbAttr = $thumb['isFinal'] ? '' : ' data-thumb-src="' . hsc($thumb['thumbUrl']) . '"';
+        // Use thumbnail metadata from helper.
+        // JS loader expects data-src (same convention as gallery thumbnails).
+        $dataThumbAttr = $thumb['isFinal'] ? '' : ' data-src="' . hsc($thumb['thumbUrl']) . '"';
 
         // Build image attributes
         $imgAttrs = 'class="media luxtools-thumb" loading="lazy" decoding="async"';
@@ -272,7 +273,7 @@ class syntax_plugin_luxtools_image extends SyntaxPlugin
         // Image with link to full size
         $renderer->doc .= '<a href="' . hsc($fullUrl) . '" class="media" target="_blank">';
         $renderer->doc .= '<img src="' . hsc($thumb['url']) . '" ' . $imgAttrs . $dataThumbAttr . ' />';
-        $renderer->doc .= '</a>';;
+        $renderer->doc .= '</a>';
 
         // Caption
         if ($caption !== '') {