The Google Tag Manager (GTM) container loads twice on your site.
Why this happens. On sites running both the HomeRunner plugin and the HomeRunner Toolkit with the Conversion Tracking module enabled, certain plugin load orders cause both components to print the GTM snippet. This is corrected in Toolkit 3.166.1, which is delivered through the normal plugin update.
What to do. After updating, view the page source and confirm the container ID appears only once.