diff --git a/Flow.Launcher.Core/Plugin/PluginManager.cs b/Flow.Launcher.Core/Plugin/PluginManager.cs
index 5c4eaa1da..8f2d78d76 100644
--- a/Flow.Launcher.Core/Plugin/PluginManager.cs
+++ b/Flow.Launcher.Core/Plugin/PluginManager.cs
@@ -281,7 +281,7 @@ namespace Flow.Launcher.Core.Plugin
             return results;
         }
 
-        public static void UpdatePluginMetadata(List<Result> results, PluginMetadata metadata, Query query)
+        public static void UpdatePluginMetadata(IReadOnlyList<Result> results, PluginMetadata metadata, Query query)
         {
             foreach (var r in results)
             {
diff --git a/Flow.Launcher.Plugin/Result.cs b/Flow.Launcher.Plugin/Result.cs
index bb005752e..9b16cc1cb 100644
--- a/Flow.Launcher.Plugin/Result.cs
+++ b/Flow.Launcher.Plugin/Result.cs
@@ -266,8 +266,9 @@ namespace Flow.Launcher.Plugin
         /// The key to identify the record. This is used when FL checks whether the result is the topmost record. Or FL calculates the hashcode of the result for user selected records.
         /// This can be useful when your plugin will change the Title or SubTitle of the result dynamically.
         /// If the plugin does not specific this, FL just uses Title and SubTitle to identify this result.
+        /// Note: Because old data does not have this key, we should use null as the default value for consistency.
         /// </summary>
-        public string RecordKey { get; set; } = string.Empty;
+        public string RecordKey { get; set; } = null;
 
         /// <summary>
         /// Info of the preview section of a <see cref="Result"/>
diff --git a/Flow.Launcher/ViewModel/MainViewModel.cs b/Flow.Launcher/ViewModel/MainViewModel.cs
index 5c3251bfc..a9809a49a 100644
--- a/Flow.Launcher/ViewModel/MainViewModel.cs
+++ b/Flow.Launcher/ViewModel/MainViewModel.cs
@@ -231,8 +231,8 @@ namespace Flow.Launcher.ViewModel
 
                     var token = e.Token == default ? _updateToken : e.Token;
 
-                    // make a copy of results to avoid plugin change the result when updating view model
-                    var resultsCopy = e.Results.ToList();
+                    // make a clone to avoid possible issue that plugin will also change the list and items when updating view model
+                    var resultsCopy = DeepCloneResults(e.Results, token);
 
                     PluginManager.UpdatePluginMetadata(resultsCopy, pair.Metadata, e.Query);
                     if (!_resultsUpdateChannelWriter.TryWrite(new ResultsForUpdate(resultsCopy, pair.Metadata, e.Query,
@@ -414,6 +414,22 @@ namespace Flow.Launcher.ViewModel
             }
         }
 
+        private static IReadOnlyList<Result> DeepCloneResults(IReadOnlyList<Result> results, CancellationToken token = default)
+        {
+            var resultsCopy = new List<Result>();
+            foreach (var result in results.ToList())
+            {
+                if (token.IsCancellationRequested)
+                {
+                    break;
+                }
+
+                var resultCopy = result.Clone();
+                resultsCopy.Add(resultCopy);
+            }
+            return resultsCopy;
+        }
+
         #endregion
 
         #region BasicCommands
@@ -1180,9 +1196,18 @@ namespace Flow.Launcher.ViewModel
 
                 currentCancellationToken.ThrowIfCancellationRequested();
 
-                results ??= _emptyResult;
+                IReadOnlyList<Result> resultsCopy;
+                if (results == null)
+                {
+                    resultsCopy = _emptyResult;
+                }
+                else
+                {
+                    // make a copy of results to avoid possible issue that FL changes some properties of the records, like score, etc.
+                    resultsCopy = DeepCloneResults(results);
+                }
 
-                if (!_resultsUpdateChannelWriter.TryWrite(new ResultsForUpdate(results, plugin.Metadata, query,
+                if (!_resultsUpdateChannelWriter.TryWrite(new ResultsForUpdate(resultsCopy, plugin.Metadata, query,
                         currentCancellationToken, reSelect)))
                 {
                     Log.Error("MainViewModel", "Unable to add item to Result Update Queue");
@@ -1471,12 +1496,31 @@ namespace Flow.Launcher.ViewModel
                     {
                         result.Score = Result.MaxScore;
                     }
-                    else if (result.Score != Result.MaxScore)
+                    else
                     {
                         var priorityScore = metaResults.Metadata.Priority * 150;
-                        result.Score += result.AddSelectedCount ?
-                            _userSelectedRecord.GetSelectedCount(result) + priorityScore :
-                            priorityScore;
+                        if (result.AddSelectedCount)
+                        {
+                            if ((long)result.Score + _userSelectedRecord.GetSelectedCount(result) + priorityScore > Result.MaxScore)
+                            {
+                                result.Score = Result.MaxScore;
+                            }
+                            else
+                            {
+                                result.Score += _userSelectedRecord.GetSelectedCount(result) + priorityScore;
+                            }
+                        }
+                        else
+                        {
+                            if ((long)result.Score + priorityScore > Result.MaxScore)
+                            {
+                                result.Score = Result.MaxScore;
+                            }
+                            else
+                            {
+                                result.Score += priorityScore;
+                            }
+                        }
                     }
                 }
             }