diff --git a/algoliasearch-apache/src/test/java/com/algolia/search/personalization/PersonalizationTest.java b/algoliasearch-apache/src/test/java/com/algolia/search/personalization/PersonalizationTest.java
index 9eefa05f9..a3cab2a59 100644
--- a/algoliasearch-apache/src/test/java/com/algolia/search/personalization/PersonalizationTest.java
+++ b/algoliasearch-apache/src/test/java/com/algolia/search/personalization/PersonalizationTest.java
@@ -14,7 +14,7 @@ class PersonalizationTest
 
   private static final PersonalizationClient personalizationClient =
       DefaultPersonalizationClient.create(
-          TestHelpers.ALGOLIA_APPLICATION_ID_1, TestHelpers.ALGOLIA_ADMIN_KEY_1, "eu");
+          TestHelpers.ALGOLIA_APPLICATION_ID_1, TestHelpers.ALGOLIA_ADMIN_KEY_1, "us");
 
   PersonalizationTest() {
     super(personalizationClient);
diff --git a/algoliasearch-core/src/main/java/com/algolia/search/models/indexing/FiltersJsonDeserializer.java b/algoliasearch-core/src/main/java/com/algolia/search/models/indexing/FiltersJsonDeserializer.java
index 20c520b9f..53f61af10 100644
--- a/algoliasearch-core/src/main/java/com/algolia/search/models/indexing/FiltersJsonDeserializer.java
+++ b/algoliasearch-core/src/main/java/com/algolia/search/models/indexing/FiltersJsonDeserializer.java
@@ -9,8 +9,9 @@
 import java.util.Arrays;
 import java.util.Collections;
 import java.util.List;
+import java.util.stream.Collectors;
 
-class FiltersJsonDeserializer extends JsonDeserializer {
+class FiltersJsonDeserializer extends JsonDeserializer<List<List<String>>> {
 
   /**
    * Algolia's specific deserializer handling multiple form of (legacy) filters This reader is
@@ -19,7 +20,8 @@ class FiltersJsonDeserializer extends JsonDeserializer {
    */
   @Override
   @SuppressWarnings("unchecked")
-  public Object deserialize(JsonParser p, DeserializationContext ctxt) throws IOException {
+  public List<List<String>> deserialize(JsonParser p, DeserializationContext ctxt)
+      throws IOException {
 
     JsonToken currentToken = p.getCurrentToken();
 
@@ -28,10 +30,10 @@ public Object deserialize(JsonParser p, DeserializationContext ctxt) throws IOEx
     switch (currentToken) {
       case START_ARRAY:
         List list = p.readValueAs(List.class);
-        if (list.get(0) instanceof String) {
+        if (list.stream().allMatch(String.class::isInstance)) { // are all elements strings?
           result = Collections.singletonList(list);
         } else {
-          result = list;
+          result = buildFilters(list);
         }
         break;
       case VALUE_STRING:
@@ -46,4 +48,19 @@ public Object deserialize(JsonParser p, DeserializationContext ctxt) throws IOEx
 
     return result;
   }
+
+  @SuppressWarnings("unchecked")
+  private List<List<String>> buildFilters(List list) {
+    return (List<List<String>>)
+        list.stream()
+            .map(
+                element -> {
+                  if (element instanceof String) {
+                    return Collections.singletonList((String) element);
+                  } else {
+                    return element; // we suppose it's a List<String>
+                  }
+                })
+            .collect(Collectors.toList());
+  }
 }
diff --git a/algoliasearch-core/src/test/java/com/algolia/search/JacksonParserTest.java b/algoliasearch-core/src/test/java/com/algolia/search/JacksonParserTest.java
index b58cda423..11a2edd40 100644
--- a/algoliasearch-core/src/test/java/com/algolia/search/JacksonParserTest.java
+++ b/algoliasearch-core/src/test/java/com/algolia/search/JacksonParserTest.java
@@ -212,6 +212,16 @@ void testLegacyFiltersFormat(String input) throws IOException {
             Defaults.getObjectMapper().readValue(nestedArrayFilters, ConsequenceParams.class),
             input));
 
+    // Testing mixed case with array and string
+    // [["color:green","color:yellow"],"color:blue"]
+    String stringAndArrayFilters =
+        String.format("{\"%s\":[[\"color:green\",\"color:yellow\"],\"color:blue\"]}", input);
+    List<List<String>> mixedDeserialized =
+        extractFilters(
+            Defaults.getObjectMapper().readValue(stringAndArrayFilters, ConsequenceParams.class),
+            input);
+    assertOREDLatestResult(mixedDeserialized);
+
     // Testing the latest format of filters i.e nested arrays
     String nestedAndedArrayFilters =
         String.format("{\"%s\":[[\"color:green\",\"color:yellow\"],[\"color:blue\"]]}", input);
@@ -220,13 +230,7 @@ void testLegacyFiltersFormat(String input) throws IOException {
         extractFilters(
             Defaults.getObjectMapper().readValue(nestedAndedArrayFilters, ConsequenceParams.class),
             input);
-
-    assertThat(deserialized).hasSize(2);
-    assertThat(deserialized.get(0)).hasSize(2);
-    assertThat(deserialized.get(0).get(0)).containsSubsequence("color:green");
-    assertThat(deserialized.get(0).get(1)).containsSubsequence("color:yellow");
-    assertThat(deserialized.get(1)).hasSize(1);
-    assertThat(deserialized.get(1).get(0)).containsSubsequence("color:blue");
+    assertOREDLatestResult(deserialized);
   }
 
   List<List<String>> extractFilters(ConsequenceParams consequenceParams, String input) {
@@ -257,6 +261,15 @@ void assertOREDResult(List<List<String>> result) {
     assertThat(result.get(0)).containsSequence("color:yellow");
   }
 
+  void assertOREDLatestResult(List<List<String>> result) {
+    assertThat(result).hasSize(2);
+    assertThat(result.get(0)).hasSize(2);
+    assertThat(result.get(0).get(0)).containsSubsequence("color:green");
+    assertThat(result.get(0).get(1)).containsSubsequence("color:yellow");
+    assertThat(result.get(1)).hasSize(1);
+    assertThat(result.get(1).get(0)).containsSubsequence("color:blue");
+  }
+
   @Test
   void testFiltersJSONDeserializerNonRegression() throws IOException {