diff --git a/src/teampulse/monitor.py b/src/teampulse/monitor.py
index 3f2313b..74ae97b 100644
--- a/src/teampulse/monitor.py
+++ b/src/teampulse/monitor.py
@@ -20,7 +20,10 @@ _POLL_JS = r"""() => {
     const msgs = [];
 
     // Channel meeting: channel-pane-message contains reply-message-header + message-body siblings
-    const channelPanes = document.querySelectorAll("[data-tid='channel-pane-message']");
+    // Filter to visible elements only — Teams SPA keeps hidden/cached panes in the DOM
+    const channelPanes = Array.from(
+        document.querySelectorAll("[data-tid='channel-pane-message']")
+    ).filter(el => el.offsetParent !== null);
     if (channelPanes.length > 0) {
         channelPanes.forEach((pane, paneIdx) => {
             const els = pane.querySelectorAll(
@@ -49,8 +52,10 @@ _POLL_JS = r"""() => {
         return msgs;
     }
 
-    // Meeting chat: chat-pane-message with message-author-name inside
-    document.querySelectorAll("[data-tid='chat-pane-message']").forEach((msg, idx) => {
+    // Meeting chat: chat-pane-message with message-author-name inside (visible only)
+    Array.from(document.querySelectorAll("[data-tid='chat-pane-message']"))
+        .filter(el => el.offsetParent !== null)
+        .forEach((msg, idx) => {
         const senderEl = msg.querySelector("[data-tid='message-author-name']");
         const sender = senderEl ? senderEl.innerText.trim() : '';
         if (!sender) return;