src/components/Filters/CategoryFilterPopup.tsx

@@ -405,10 +405,22 @@ const CategoryCheckbox: React.FC<CategoryCheckboxProps> = ({
     const anyChildCombinationSelected = childPaths.some((childPath) =>
       selectedCombinations.includes(childPath)
     )
-    setIsIndeterminate(
-      anyChildCombinationSelected && !selectedCombinations.includes(pathString)
+    const anyChildCombinationLinked = childPaths.some(
+      (childPath) =>
+        linkedHierarchy !== null && linkedHierarchy.includes(childPath)
     )
-  }, [category, name, path, selectedCombinations, selectedSingles])
+    setIsIndeterminate(
+      (anyChildCombinationSelected || anyChildCombinationLinked) &&
+        !selectedCombinations.includes(pathString)
+    )
+  }, [
+    category,
+    linkedHierarchy,
+    name,
+    path,
+    selectedCombinations,
+    selectedSingles
+  ])
 
   const handleSingleChange = () => {
     setIsSingleChecked(!isSingleChecked)