diff --git a/src/main/java/clap/server/adapter/inbound/web/dto/admin/request/RegisterMemberRequest.java b/src/main/java/clap/server/adapter/inbound/web/dto/admin/request/RegisterMemberRequest.java
index 10f82be1..89920c72 100644
--- a/src/main/java/clap/server/adapter/inbound/web/dto/admin/request/RegisterMemberRequest.java
+++ b/src/main/java/clap/server/adapter/inbound/web/dto/admin/request/RegisterMemberRequest.java
@@ -24,7 +24,7 @@ public record RegisterMemberRequest(
         Long departmentId,
         @NotNull @Schema(description = "회원 역할")
         MemberRole role,
-        @NotBlank @Schema(description = "회원 직책")
+        @Schema(description = "회원 직책")
         String departmentRole
 ) {
 }
diff --git a/src/main/java/clap/server/application/service/admin/CsvParseService.java b/src/main/java/clap/server/application/service/admin/CsvParseService.java
index 38578481..8d2db89a 100644
--- a/src/main/java/clap/server/application/service/admin/CsvParseService.java
+++ b/src/main/java/clap/server/application/service/admin/CsvParseService.java
@@ -61,7 +61,7 @@ private Member mapToMember(String[] fields, List<Department> departments) {
                 .findFirst()
                 .orElseThrow(() -> new ApplicationException(DepartmentErrorCode.DEPARTMENT_NOT_FOUND));
 
-        managerDepartmentPolicy.validateDepartment(department, MemberRole.valueOf(fields[3].trim()));
+        managerDepartmentPolicy.validateDepartment(department, MemberRole.valueOf(fields[5].trim()));
         MemberInfo memberInfo = toMemberInfo(
                 fields[0].trim(), // name
                 fields[4].trim(), // email
diff --git a/src/main/java/clap/server/domain/model/task/Attachment.java b/src/main/java/clap/server/domain/model/task/Attachment.java
index 3d48ff55..21f02f64 100644
--- a/src/main/java/clap/server/domain/model/task/Attachment.java
+++ b/src/main/java/clap/server/domain/model/task/Attachment.java
@@ -45,9 +45,13 @@ public void softDelete() {
     }
 
     public static String formatFileSize(long size) {
-        if (size < 1024) return size + " B";
-        int z = (63 - Long.numberOfLeadingZeros(size)) / 10;
-        return String.format("%.1f %sB", (double) size / (1L << (z * 10)), " KMGTPE".charAt(z));
+        if (size < 1024) {
+            return size + " B";
+        } else if (size < 1024 * 1024) {
+            return String.format("%.1f KB", size / 1024.0);
+        } else {
+            return String.format("%.1f MB", size / (1024.0 * 1024.0));
+        }
     }
 
 }