diff --git a/sbas/templates/sbas/partials/import_preview.html b/sbas/templates/sbas/partials/import_preview.html
index 20d60510..48e5008f 100644
--- a/sbas/templates/sbas/partials/import_preview.html
+++ b/sbas/templates/sbas/partials/import_preview.html
@@ -157,32 +157,37 @@ missing_map: {{ item.missing_map|default:"{}" }}</pre>
   // Toggle exclude: clicking a M2M button will add/remove a hidden input and update styles
   function setupToggle(btn){
     btn.addEventListener('click', function(){
-      const idx = btn.dataset.idx;
       const model = btn.dataset.model;
       const value = btn.dataset.value;
-      const container = document.getElementById('exclude-container-' + idx);
-      const inputName = 'exclude_' + idx;
-      // check if an input for this value already exists
-      const selector = 'input[data-model="' + model + '"][data-value="' + value + '"]';
-      const existing = container ? container.querySelector(selector) : null;
-      if(existing){
-        // remove input and toggle style to outline
-        existing.remove();
-        btn.classList.remove('btn-outline-secondary');
-        btn.classList.remove('btn-secondary');
-        btn.classList.add('btn-success');
-      } else {
-        const inp = document.createElement('input');
-        inp.type = 'hidden';
-        inp.name = inputName;
-        inp.value = model + ':::' + value;
-        inp.setAttribute('data-model', model);
-        inp.setAttribute('data-value', value);
-        container.appendChild(inp);
-        // set button to excluded appearance
-        btn.classList.remove('btn-success');
-        btn.classList.add('btn-outline-secondary');
-      }
+
+      // Find all buttons with same model+value and toggle them together
+      document.querySelectorAll('.m2m-toggle').forEach(function(b){
+        if(b.dataset.model === model && b.dataset.value === value){
+          const idx2 = b.dataset.idx;
+          const container = document.getElementById('exclude-container-' + idx2);
+          const inputName = 'exclude_' + idx2;
+          const existing = container ? container.querySelector('input[data-model="' + model + '"][data-value="' + value + '"]') : null;
+          if(existing){
+            existing.remove();
+            b.classList.remove('btn-outline-secondary');
+            b.classList.remove('btn-secondary');
+            b.classList.add('btn-success');
+          } else {
+            const inp = document.createElement('input');
+            inp.type = 'hidden';
+            inp.name = inputName;
+            inp.value = model + ':::' + value;
+            inp.setAttribute('data-model', model);
+            inp.setAttribute('data-value', value);
+            container.appendChild(inp);
+            b.classList.remove('btn-success');
+            b.classList.add('btn-outline-secondary');
+          }
+        }
+      });
+
+      // Update empty placeholders after toggling
+      refreshEmptyPlaceholders();
     });
   }
 
@@ -193,10 +198,11 @@ missing_map: {{ item.missing_map|default:"{}" }}</pre>
   // Show '(none)' for empty groups
   function refreshEmptyPlaceholders(){
     document.querySelectorAll('.m2m-group').forEach(function(group){
-      const buttons = group.querySelectorAll('.m2m-toggle');
+      // consider a button 'active' only if it has the green btn-success class
+      const activeButtons = group.querySelectorAll('.m2m-toggle.btn-success');
       const none = group.querySelector('.m2m-none');
       if(!none) return;
-      if(buttons.length === 0){
+      if(activeButtons.length === 0){
         none.style.display = '';
       } else {
         none.style.display = 'none';