diff --git a/_includes/layouts/base.njk b/_includes/layouts/base.njk
index 23d5f5e..3ded1d2 100644
--- a/_includes/layouts/base.njk
+++ b/_includes/layouts/base.njk
@@ -23,10 +23,12 @@
   <meta property="og:type" content="{% if page.url == '/' %}website{% else %}article{% endif %}">
   <meta property="og:description" content="{{ ogDesc }}">
   <meta name="description" content="{{ ogDesc }}">
-  {# Compute OG slug from permalink (frontmatter), NOT page.url or eleventyComputed.
-     permalink is per-file data immune to Eleventy 3.x parallel rendering race conditions.
-     page.url, page.inputPath, and eleventyComputed values can return data from OTHER pages. #}
-  {% set _ogSlug = permalink | ogSlug %}
+  {# Compute OG slug from page.url — NOT permalink or eleventyComputed values.
+     Eleventy 3.x parallel rendering (issue #3183) cross-contaminates eleventyComputed
+     return values across pages. permalink is set by eleventyComputed and is UNRELIABLE.
+     page.url is set by Eleventy's internal pipeline and IS correct in templates
+     (verified: og:url uses page.url and always shows the right URL). #}
+  {% set _ogSlug = page.url | ogSlug %}
   {% set _hasOg = _ogSlug | hasOgImage %}
   {% if ogPhoto and ogPhoto != "" and (ogPhoto | length) > 10 %}
   <meta property="og:image" content="{% if 'http' in ogPhoto %}{{ ogPhoto }}{% else %}{{ site.url }}{% if ogPhoto[0] != '/' %}/{% endif %}{{ ogPhoto }}{% endif %}">