diff --git a/assets/layers/climbing_area/climbing_area.json b/assets/layers/climbing_area/climbing_area.json
index 02a1849772..4f443eb620 100644
--- a/assets/layers/climbing_area/climbing_area.json
+++ b/assets/layers/climbing_area/climbing_area.json
@@ -35,7 +35,7 @@
     "_contained_climbing_routes_properties=overlapWith(feat)('climbing_route').map(f => f.feat.properties).map(p => {return {id: p.id, name: p.name, 'climbing:grade:french': p['climbing:grade:french'], 'climbing:length': p['climbing:length']} })",
     "_contained_climbing_routes=get(feat)('_contained_climbing_routes_properties')?.map(p => `<li><a href='#${p.id}'>${p.name ?? 'climbing route'}</a> (<b class='climbing-${p['__difficulty:char']} rounded-full p-l-1 p-r-1'>${p['climbing:grade:french'] ?? 'unknown difficulty'}</b>, ${p['climbing:length'] ?? 'unkown length'} meter)</li>`).join('')",
     "_contained_climbing_route_ids=get(feat)('_contained_climbing_routes_properties')?.map(p => p.id)",
-    "_difficulty_hist=get(feat)('_contained_climbing_routes_properties')?.map(p => p['climbing:grade:french'])?.filter(p => (p ?? null) !== null)?.sort()",
+    "_difficulty_hist=get(feat)('_contained_climbing_routes_properties')?.map(p => p['climbing:grade:french'])?.filter(p => (p ?? null) !== null)?.map(diff => ''+parseInt(diff))?.sort()",
     "_difficulty_max=get(feat)('_difficulty_hist')?.at(-1)",
     "_difficulty_min=get(feat)('_difficulty_hist')?.at(0)",
     "_length_hist=get(feat)('_contained_climbing_routes_properties')?.map(p => p['climbing:length'])?.filter(p => (p ?? null)  !== null)?.sort()",
@@ -221,8 +221,7 @@
           "key": "_length_hist"
         }
       },
-      "condition": "_length_hist!~\\[\\]",
-      "classes": "w-64 h-96"
+      "condition": "_length_hist!~\\[\\]"
     },
     {
       "id": "difficulty_hist_title",
@@ -247,8 +246,7 @@
           "key": "_difficulty_hist"
         }
       },
-      "condition": "_difficulty_hist!~\\[\\]",
-      "classes": "w-64 h-96"
+      "condition": "_difficulty_hist!~\\[\\]"
     },
     {
       "id": "Contained_climbing_routes",