diff --git a/app-backend/controllers/ad.controller.js b/app-backend/controllers/ad.controller.js
index 0182491..2b6dd6f 100644
--- a/app-backend/controllers/ad.controller.js
+++ b/app-backend/controllers/ad.controller.js
@@ -70,7 +70,7 @@ exports.findAll = (req, res) => {
     query.url = condition;
 
     const interests = req.query.interests;
-    condition = interests ? {$in: interests} : undefined;
+    condition = interests ? {$in: interests.split(',')} : undefined;
     query["interests.interest"] = condition
 
     const comment = req.query.comment;
@@ -174,9 +174,9 @@ exports.update = (req, res) => {
       condition = url ? url : undefined;
       update.url = condition;
 
-      const interests = req.body.interests;
-      condition = interests ? interests : undefined;
-      update.interests = condition;
+      let interests = req.body.interests;
+      condition = interests ? {interests: [...new Map(interests.map(v => [v.id, v])).values()]} : undefined;
+      update.$addToSet = condition;
 
       const comment = req.body.comment;
       condition = comment ? comment : undefined;
diff --git a/app-backend/controllers/user.controller.js b/app-backend/controllers/user.controller.js
index dedab4e..125c6d3 100644
--- a/app-backend/controllers/user.controller.js
+++ b/app-backend/controllers/user.controller.js
@@ -457,7 +457,8 @@ exports.history = (req, res) => {
           watchedDate: {$arrayElemAt: ["$watchedDates", -1]},
           createdAt: true,
           updatedAt: true
-        }}])
+        }},
+        {$sort: {watchedDate: -1}}])
       .then(async data => {
         let yt_results = [];
         let dm_results = [];