diff --git a/src/components/room/RoomChatPanel.tsx b/src/components/room/RoomChatPanel.tsx
index fd1af43..da82307 100644
--- a/src/components/room/RoomChatPanel.tsx
+++ b/src/components/room/RoomChatPanel.tsx
@@ -104,8 +104,13 @@ const ChatInputArea = memo(function ChatInputArea({
       count += node.length;
     }
     if (count !== prevCursorRef.current) {
-      prevCursorRef.current = count;
-      ms.setCursorOffset(count);
+      // Skip update when caret is at end of text (programmatic value change
+      // that already positioned the caret — the caret hasn't moved from the
+      // user's perspective). Only update on real user-initiated cursor movement.
+      if (count !== ms.value.length || prevCursorRef.current !== ms.value.length) {
+        prevCursorRef.current = count;
+        ms.setCursorOffset(count);
+      }
     }
   });