diff --git a/src/CommonLib/Enums/CollectionMethods.cs b/src/CommonLib/Enums/CollectionMethods.cs
index 1964f863..d4ebf61e 100644
--- a/src/CommonLib/Enums/CollectionMethods.cs
+++ b/src/CommonLib/Enums/CollectionMethods.cs
@@ -24,10 +24,11 @@ public enum ResolvedCollectionMethod
         UserRights = 1 << 15,
         CARegistry = 1 << 16,
         DCRegistry = 1 << 17,
+        CertServices = 1 << 18,
         LocalGroups = DCOM | RDP | LocalAdmin | PSRemote,
         ComputerOnly = LocalGroups | Session | UserRights | CARegistry | DCRegistry,
-        DCOnly = ACL | Container | Group | ObjectProps | Trusts | GPOLocalGroup,
-        Default = Group | Session | Trusts | ACL | ObjectProps | LocalGroups | SPNTargets | Container,
+        DCOnly = ACL | Container | Group | ObjectProps | Trusts | GPOLocalGroup | CertServices,
+        Default = Group | Session | Trusts | ACL | ObjectProps | LocalGroups | SPNTargets | Container | CertServices,
         All = Default | LoggedOn | GPOLocalGroup | UserRights | CARegistry | DCRegistry
     }
 }
\ No newline at end of file
diff --git a/src/CommonLib/LDAPQueries/LDAPFilter.cs b/src/CommonLib/LDAPQueries/LDAPFilter.cs
index 5474e9b4..ab7296ad 100644
--- a/src/CommonLib/LDAPQueries/LDAPFilter.cs
+++ b/src/CommonLib/LDAPQueries/LDAPFilter.cs
@@ -245,16 +245,23 @@ public LDAPFilter AddFilter(string filter, bool enforce)
         /// <returns></returns>
         public string GetFilter()
         {
-            var temp = string.Join("", _filterParts.ToArray());
-            if (_filterParts.Count == 1)
-                temp = _filterParts[0];
-            else if (_filterParts.Count > 1)
-                 temp = $"(|{temp})";
 
-            var mandatory = string.Join("", _mandatory.ToArray());
-            temp = _mandatory.Count > 0 ? $"(&{temp}{mandatory})" : temp;
+            var filterPartList = _filterParts.ToArray().Distinct();
+            var mandatoryList = _mandatory.ToArray().Distinct();
 
-            return temp;
+            var filterPartsExceptMandatory = filterPartList.Except(mandatoryList).ToList();
+
+            var filterPartsDistinct = string.Join("", filterPartsExceptMandatory);
+            var mandatoryDistinct = string.Join("", mandatoryList);
+
+            if (filterPartsExceptMandatory.Count == 1)
+                filterPartsDistinct = filterPartsExceptMandatory[0];
+            else if (filterPartsExceptMandatory.Count > 1)
+                filterPartsDistinct = $"(|{filterPartsDistinct})";
+
+            filterPartsDistinct = _mandatory.Count > 0 ? $"(&{filterPartsDistinct}{mandatoryDistinct})" : filterPartsDistinct;
+
+            return filterPartsDistinct;
         }
 
         public IEnumerable<string> GetFilterList()