修复

app/controllers/api/v1/issues/issue_tags_controller.rb

@@ -4,8 +4,8 @@ class Api::V1::Issues::IssueTagsController < Api::V1::BaseController
   before_action :require_operate_above, only: [:create, :update, :destroy]
 
   def index 
-    @issue_tags = @project.issue_tags.order("#{order_by} #{order_direction}")
     @issue_tags = @issue_tags.ransack(name_cont: params[:keyword]).result if params[:keyword].present?
+    @issue_tags = @project.issue_tags.reorder("#{sort_by} #{sort_direction}")
     if params[:only_name]
       @issue_tags = kaminary_select_paginate(@issue_tags.select(:id, :name, :color))
     else 
@@ -43,16 +43,16 @@ class Api::V1::Issues::IssueTagsController < Api::V1::BaseController
 
 
   private 
-  def order_by
-    order_by = params.fetch(:order_by, "created_at")
-    order_by = IssueTag.column_names.include?(order_by) ? order_by : "created_at"
-    order_by
+  def sort_by
+    sort_by = params.fetch(:sort_by, "created_at")
+    sort_by = IssueTag.column_names.include?(sort_by) ? sort_by : "created_at"
+    sort_by
   end
 
-  def order_direction 
-    order_direction = params.fetch(:order_direction, "desc").downcase
-    order_direction = %w(desc asc).include?(order_direction) ? order_direction : "desc"
-    order_direction
+  def sort_direction 
+    sort_direction = params.fetch(:sort_direction, "desc").downcase
+    sort_direction = %w(desc asc).include?(sort_direction) ? sort_direction : "desc"
+    sort_direction
   end
 
   def issue_tag_params 

app/services/api/v1/issues/list_service.rb

@@ -70,9 +70,9 @@ class Api::V1::Issues::ListService < ApplicationService
     # keyword
     issues = issues.ransack(subject_or_description_cont: keyword).result if keyword.present?
 
-    @total_issues_count = issues.size
-    @closed_issues_count = issues.closed.size 
-    @opened_issues_count = issues.opened.size
+    @total_issues_count = issues.distinct.size
+    @closed_issues_count = issues.closed.distinct.size 
+    @opened_issues_count = issues.opened.distinct.size
 
     case category 
     when 'closed'