I’m looking for an experienced Analytics & Tracking specialist (Google Tag Manager + GA4 + Google Ads) to fix a data contamination issue between two domains and two Google Ads accounts. My situation: I have two different domains (two websites). I have two separate Google Ads accounts (each domain should have its own Ads account). Previously, I used one GTM container for both domains. I created a new GTM container for one domain, but I still see that the website is loading/seeing multiple containers or tags, causing duplicate tracking and mixed/contaminated analytics data. The websites run on WordPress, and I’m using a Google Tag Manager plugin. I also use caching/performance optimization (e.g., NitroPack or similar) which may affect tag loading. What I Need From the Specialist Diagnose the exact source of the overlap/duplication, such as: GTM / gtag.js installed more than once (theme + plugin + GTM) “Destinations / Connected tags” causing data to be sent to another GA4 property Cache/performance tools delaying, combining, or duplicating scripts Incorrect triggers/events firing multiple times Clean up and rebuild the tracking setup so it becomes: Each domain loads one GTM container only Each domain uses one GA4 property/stream only (correct and isolated) Each domain is connected only to its correct Google Ads account (conversions + remarketing) No unexpected Tag IDs appear in Tag Assistant / Network requests Implement the fix and document it: Remove any extra/duplicate tracking code from WordPress theme/plugin settings Correctly configure GTM tags (Google Tag/GA4/Ads + Conversion Linker, etc.) Adjust cache settings to exclude GTM/GA scripts from delay/merge if needed Final validation using Tag Assistant + Chrome DevTools Network Provide a short report: root cause, changes made, and how to avoid this issue in the future Deliverables Each domain running one container only with no duplicate loads GA4 tracking working correctly (page_view/events) with no duplication Google Ads conversions working correctly with no cross-account/domain data List of required cache exclusions (if applicable) Brief documentation (steps + screenshots or a short recording) Requirements Proven experience with GTM + GA4 + Google Ads + WordPress Experience troubleshooting caching tools like NitroPack is a plus Work done safely (limited access or screen-sharing if needed) Quick Notes Platform: WordPress GTM plugin is installed Current issue: multiple containers/tags detected and tracking data mixing between domains Goal: clean separation—one domain = one GTM container + one GA4 + one Ads account