diff --git a/app/core/src/main/java/stirling/software/SPDF/model/api/SplitPdfByChaptersRequest.java b/app/core/src/main/java/stirling/software/SPDF/model/api/SplitPdfByChaptersRequest.java
index 364faeca4..390a2898c 100644
--- a/app/core/src/main/java/stirling/software/SPDF/model/api/SplitPdfByChaptersRequest.java
+++ b/app/core/src/main/java/stirling/software/SPDF/model/api/SplitPdfByChaptersRequest.java
@@ -12,20 +12,20 @@ import stirling.software.common.model.api.PDFFile;
 public class SplitPdfByChaptersRequest extends PDFFile {
     @Schema(
             description = "Whether to include Metadata or not",
-            defaultValue = "true",
+            defaultValue = "false",
             requiredMode = Schema.RequiredMode.REQUIRED)
     private Boolean includeMetadata;
 
     @Schema(
             description = "Whether to allow duplicates or not",
-            defaultValue = "true",
+            defaultValue = "false",
             requiredMode = Schema.RequiredMode.REQUIRED)
     private Boolean allowDuplicates;
 
     @Schema(
             description = "Maximum bookmark level required",
             minimum = "0",
-            defaultValue = "2",
+            defaultValue = "0",
             requiredMode = Schema.RequiredMode.REQUIRED)
     private Integer bookmarkLevel;
 }
diff --git a/app/core/src/main/java/stirling/software/SPDF/model/api/SplitPdfBySectionsRequest.java b/app/core/src/main/java/stirling/software/SPDF/model/api/SplitPdfBySectionsRequest.java
index 438f1d9d7..2f9370261 100644
--- a/app/core/src/main/java/stirling/software/SPDF/model/api/SplitPdfBySectionsRequest.java
+++ b/app/core/src/main/java/stirling/software/SPDF/model/api/SplitPdfBySectionsRequest.java
@@ -44,7 +44,7 @@ public class SplitPdfBySectionsRequest extends PDFFile {
 
     @Schema(
             description = "Merge the split documents into a single PDF",
-            defaultValue = "true",
+            defaultValue = "false",
             requiredMode = Schema.RequiredMode.REQUIRED)
     private Boolean merge;
 }
diff --git a/app/core/src/main/java/stirling/software/SPDF/model/api/misc/AddStampRequest.java b/app/core/src/main/java/stirling/software/SPDF/model/api/misc/AddStampRequest.java
index 48d470a5a..98dbcdbcc 100644
--- a/app/core/src/main/java/stirling/software/SPDF/model/api/misc/AddStampRequest.java
+++ b/app/core/src/main/java/stirling/software/SPDF/model/api/misc/AddStampRequest.java
@@ -27,7 +27,7 @@ public class AddStampRequest extends PDFWithPageNums {
 
     @Schema(
             description = "The selected alphabet of the stamp text",
-            allowableValues = {"roman", "arabic", "japanese", "korean", "chinese"},
+            allowableValues = {"roman", "arabic", "japanese", "korean", "chinese", "thai"},
             defaultValue = "roman")
     private String alphabet = "roman";
 
@@ -55,7 +55,7 @@ public class AddStampRequest extends PDFWithPageNums {
                             + " 3: bottom-right, 4: middle-left, 5: middle-center, 6: middle-right,"
                             + " 7: top-left, 8: top-center, 9: top-right)",
             allowableValues = {"1", "2", "3", "4", "5", "6", "7", "8", "9"},
-            defaultValue = "5",
+            defaultValue = "8",
             requiredMode = Schema.RequiredMode.REQUIRED)
     private int position;
 
diff --git a/app/core/src/main/java/stirling/software/SPDF/model/api/security/AddWatermarkRequest.java b/app/core/src/main/java/stirling/software/SPDF/model/api/security/AddWatermarkRequest.java
index 00408c55e..88d3ba45b 100644
--- a/app/core/src/main/java/stirling/software/SPDF/model/api/security/AddWatermarkRequest.java
+++ b/app/core/src/main/java/stirling/software/SPDF/model/api/security/AddWatermarkRequest.java
@@ -27,7 +27,7 @@ public class AddWatermarkRequest extends PDFFile {
 
     @Schema(
             description = "The selected alphabet",
-            allowableValues = {"roman", "arabic", "japanese", "korean", "chinese"},
+            allowableValues = {"roman", "arabic", "japanese", "korean", "chinese", "thai"},
             defaultValue = "roman")
     private String alphabet;