diff --git a/frontend/app/duck/search.js b/frontend/app/duck/search.js
index 54b3f0132..9e4b9396e 100644
--- a/frontend/app/duck/search.js
+++ b/frontend/app/duck/search.js
@@ -349,20 +349,38 @@ export const hasFilterApplied = (filters, filter) => {
     return !filter.isEvent && filters.some((f) => f.key === filter.key);
 };
 
+const getAppliedFilterIndex = (filters, filterToFind) => {
+    if (!filterToFind.isEvent) {
+      return filters.findIndex((filter) => filter.key === filterToFind.key);
+    }
+    return -1;
+  };
+  
 export const addFilter = (filter) => (dispatch, getState) => {
     filter.value = checkFilterValue(filter.value);
     filter.filters = filter.filters
-        ? filter.filters.map((subFilter) => ({
-              ...subFilter,
-              value: checkFilterValue(subFilter.value),
-          }))
-        : null;
-    const instance = getState().getIn(['search', 'instance']);
+    ? filter.filters.map((subFilter) => ({
+        ...subFilter,
+        value: checkFilterValue(subFilter.value),
+        }))
+    : null;
 
-    if (hasFilterApplied(instance.filters, filter)) {
+    const instance = getState().getIn(['search', 'instance']);
+    const filters = instance.get('filters');
+    const index = getAppliedFilterIndex(filters, filter);
+
+    if (index !== -1) {
+    const oldFilter = filters.get(index);
+    const updatedFilter = {
+        ...oldFilter,
+        value: oldFilter.value.concat(filter.value),
+    };
+
+    const updatedFilters = filters.set(index, updatedFilter);
+    return dispatch(edit(instance.set('filters', updatedFilters)));
     } else {
-        const filters = instance.filters.push(filter);
-        return dispatch(edit(instance.set('filters', filters)));
+    const updatedFilters = filters.push(filter);
+    return dispatch(edit(instance.set('filters', updatedFilters)));
     }
 };