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Your GA4 bounce rate is likely 0% because an event (like a scroll or pageview) is triggering multiple times or immediately upon load, causing GA4 to log it as an 'Engaged Session' instantly.
In Google Analytics 4, 'Bounce Rate' is not what it used to be. It is now the exact inverse of 'Engagement Rate'. If a session lasts 10 seconds, has a conversion event, or has 2+ page views, it's NOT a bounce.
A 0% or unnaturally low (< 10%) bounce rate almost always indicates a technical configuration error rather than actual highly engaged users. Usually, you have a rogue tag in Google Tag Manager firing twice when the page loads, instantly logging 2 hits to GA4 and making every single visit count as an "Engaged Session".
Open Google Tag Manager and enter Preview Mode.
Navigate to your website and observe the 'Tags Fired' on the very first 'Container Loaded' event.
If your GA4 Configuration Tag (or any event tag) fires more than once, you have found the culprit.
Alternatively, use our GTM Audit Tool to automatically scan your container for duplicate and misconfigured tags.
Instead of clicking through settings yourself, the audit checks this exact issue (and 30 others) on your GTM container — then keeps watching every night.
Run the GTM audit