Technical fix guide
Duplicate GTM Container
Multiple GTM containers or duplicate GTM snippets detected. This can cause tags to fire multiple times and create data conflicts.
Issue ID: ANALYTICS-DUP-GTM-001
Severity: moderate
Impact: Med
Effort: S
Use this article when
- You need deeper remediation guidance than the issue card can show.
- You want CMS-specific steps before handing the fix to a developer.
- You want a repeatable re-check path after shipping the change.
What this issue is
Multiple GTM containers or duplicate GTM snippets detected. This can cause tags to fire multiple times and create data conflicts.
Why it matters
Multiple GTM containers or duplicate GTM snippets detected. This can cause tags to fire multiple times and create data conflicts. This affects crawlability, rendering, and whether the site can be interpreted correctly by search engines.
How we detect it
- FreeSiteAudit flags this issue when the rule for ANALYTICS-DUP-GTM-001 fails and the page evidence points to Dom body.
- You can usually confirm this by checking the page source or the relevant page settings inside your CMS.
Evidence examples
Check the affected page source, rendered output, or relevant CMS setting to confirm the missing or incorrect element.
How to fix it
- 1Use only one GTM container per page
- 2If multiple containers are intentional, ensure tags do not overlap
- 3Remove duplicate GTM snippets from the HTML
How to re-check it
- Only one GTM container ID loads per page
Related tools
This issue is best verified with the full FreeSiteAudit crawl rather than a single-point mini tool.