diff --git a/CHANGELOG.txt b/CHANGELOG.txt
index b5c6c21b9..01eff36a4 100644
--- a/CHANGELOG.txt
+++ b/CHANGELOG.txt
@@ -3,6 +3,7 @@
 ==== Unreleased
  * FIX: Cookie使用時に「Listの発言取得に公式RTを含める」の設定が適用されない不具合を修正
  * FIX: Twitterアカウントでの画像を添付したツイートの投稿がエラーになる不具合を修正
+ * FIX: 設定画面を閉じた直後に取得されるツイートが全て両思い表示になる不具合を修正
 
 ==== Ver 3.15.0(2024/06/14)
  * NEW: Misskeyでのノート投稿時のファイル添付に対応しました
diff --git a/OpenTween/SocialProtocol/Misskey/MisskeyAccount.cs b/OpenTween/SocialProtocol/Misskey/MisskeyAccount.cs
index 3aed2b624..c1fe6b12e 100644
--- a/OpenTween/SocialProtocol/Misskey/MisskeyAccount.cs
+++ b/OpenTween/SocialProtocol/Misskey/MisskeyAccount.cs
@@ -42,7 +42,7 @@ ISocialProtocolClient ISocialAccount.Client
 
         public bool IsDisposed { get; private set; }
 
-        public MisskeyAccountState AccountState { get; private set; } = new();
+        public MisskeyAccountState AccountState { get; } = new();
 
         ISocialAccountState ISocialAccount.AccountState
             => this.AccountState;
@@ -71,14 +71,10 @@ public void Initialize(UserAccount accountSettings, SettingCommon settingCommon)
         {
             Debug.Assert(accountSettings.UniqueKey == this.UniqueKey.Id, "UniqueKey must be same as current value.");
 
-            var serverUri = new Uri($"https://{accountSettings.ServerHostname}/");
-            this.AccountState = new(serverUri, new(accountSettings.UserId), accountSettings.Username)
-            {
-                AuthorizedScopes = accountSettings.Scopes,
-                HasUnrecoverableError = false,
-            };
+            this.AccountState.UpdateFromSettings(accountSettings);
+            this.AccountState.HasUnrecoverableError = false;
 
-            var apiBaseUri = new Uri(serverUri, "/api/");
+            var apiBaseUri = new Uri(this.AccountState.ServerUri, "/api/");
 
             var newConnection = new MisskeyApiConnection(apiBaseUri, accountSettings.TokenSecret, this.AccountState);
             (this.connection, var oldConnection) = (newConnection, this.connection);
diff --git a/OpenTween/SocialProtocol/Misskey/MisskeyAccountState.cs b/OpenTween/SocialProtocol/Misskey/MisskeyAccountState.cs
index 972f54c2d..483e24d75 100644
--- a/OpenTween/SocialProtocol/Misskey/MisskeyAccountState.cs
+++ b/OpenTween/SocialProtocol/Misskey/MisskeyAccountState.cs
@@ -68,6 +68,14 @@ public MisskeyAccountState(Uri serverUri, MisskeyUserId userId, string userName)
             this.UserName = userName;
         }
 
+        public void UpdateFromSettings(UserAccount accountSettings)
+        {
+            this.ServerUri = new($"https://{accountSettings.ServerHostname}/");
+            this.UserId = new(accountSettings.UserId);
+            this.UserName = accountSettings.Username;
+            this.AuthorizedScopes = accountSettings.Scopes;
+        }
+
         /// <summary>ユーザー情報を更新します</summary>
         public void UpdateFromUser(MisskeyUser self)
         {
diff --git a/OpenTween/SocialProtocol/Twitter/TwitterAccount.cs b/OpenTween/SocialProtocol/Twitter/TwitterAccount.cs
index aac7607f8..03a17c8e3 100644
--- a/OpenTween/SocialProtocol/Twitter/TwitterAccount.cs
+++ b/OpenTween/SocialProtocol/Twitter/TwitterAccount.cs
@@ -41,7 +41,7 @@ public string AccountType
 
         public bool IsDisposed { get; private set; }
 
-        public TwitterAccountState AccountState { get; private set; } = new();
+        public TwitterAccountState AccountState { get; } = new();
 
         ISocialAccountState ISocialAccount.AccountState
             => this.AccountState;
@@ -72,12 +72,9 @@ public void Initialize(UserAccount accountSettings, SettingCommon settingCommon)
             Debug.Assert(accountSettings.UniqueKey == this.UniqueKey.Id, "UniqueKey must be same as current value.");
 
             var credential = accountSettings.GetTwitterCredential();
-            var userId = new TwitterUserId(accountSettings.UserId);
 
-            this.AccountState = new TwitterAccountState(userId, accountSettings.Username)
-            {
-                HasUnrecoverableError = credential is TwitterCredentialNone,
-            };
+            this.AccountState.UpdateFromSettings(accountSettings);
+            this.AccountState.HasUnrecoverableError = credential is TwitterCredentialNone;
 
             var newConnection = new TwitterApiConnection(credential, this.AccountState);
             (this.apiConnection, var oldConnection) = (newConnection, this.apiConnection);
diff --git a/OpenTween/SocialProtocol/Twitter/TwitterAccountState.cs b/OpenTween/SocialProtocol/Twitter/TwitterAccountState.cs
index edda96541..63bd60802 100644
--- a/OpenTween/SocialProtocol/Twitter/TwitterAccountState.cs
+++ b/OpenTween/SocialProtocol/Twitter/TwitterAccountState.cs
@@ -73,6 +73,12 @@ public TwitterAccountState(TwitterUserId userId, string userName)
             this.UserName = userName;
         }
 
+        public void UpdateFromSettings(UserAccount accountSettings)
+        {
+            this.UserId = new(accountSettings.UserId);
+            this.UserName = accountSettings.Username;
+        }
+
         /// <summary>ユーザー情報を更新します</summary>
         public void UpdateFromUser(TwitterUser self)
         {