diff --git a/src/components/Map/markerManager.js b/src/components/Map/markerManager.js
index 264a7b7..3f25375 100644
--- a/src/components/Map/markerManager.js
+++ b/src/components/Map/markerManager.js
@@ -789,9 +789,10 @@ function collectGalleryImages(post) {
   const seen = new Set();
   const seenBase = new Set();
   // Get base filename without size suffix to detect same image in different sizes
+  // Handles both long (_large, _medium, _small) and short (_l, _m, _s) variants
   const getBase = (url) => {
     if (!url) return '';
-    return url.replace(/[-_](large|medium|small|thumb|thumbnail)(\.[^.]+)?$/i, '$2')
+    return url.replace(/[-_](large|medium|small|thumb|thumbnail|l|m|s)(\.[^.]+)?$/i, '$2')
               .replace(/\?.*$/, ''); // Remove query params
   };
   const add = (value) => {
diff --git a/src/components/Posts/PostDetailModal.jsx b/src/components/Posts/PostDetailModal.jsx
index d2fda3f..52205ea 100644
--- a/src/components/Posts/PostDetailModal.jsx
+++ b/src/components/Posts/PostDetailModal.jsx
@@ -585,14 +585,15 @@ export default function PostDetailModal({ post, onClose, onPostUpdated, onPostDe
   const config = getCategoryConfig(post?.category);
   const author = post?.author || post?.username || post?.source_name || t("common.anon");
 
-  // Media gallery - dedupe by base filename (ignore size variants like _large, _medium, _small)
+  // Media gallery - dedupe by base filename (ignore size variants like _large, _medium, _small, _l, _m, _s)
   const gallery = useMemo(() => {
     const seen = new Set();
     const seenBase = new Set();
     const images = [];
     const getBase = (url) => {
       // Remove size suffixes to detect same image in different sizes
-      return url.replace(/[-_](large|medium|small|thumb|thumbnail)(\.[^.]+)?$/i, '$2')
+      // Handles both long (_large, _medium, _small) and short (_l, _m, _s) variants
+      return url.replace(/[-_](large|medium|small|thumb|thumbnail|l|m|s)(\.[^.]+)?$/i, '$2')
                 .replace(/\?.*$/, ''); // Remove query params
     };
     const add = (url) => {