Thanks for your question. The "Duplicate pageviews" error in the results are tied to Google Analytics firing twice on the same pages for the same UA number. Tag Inspector is capable of doing deeper validation for Google Analytics and can detect if a single Google Analytics Account (with a unique UA number) fires twice on any given page.
This is considered an error because typically a unique Google Analytics account should fire only once on pageload for any given page, as double firing/tracking would inflate pageviews tracked for that visit/visitor and severely impact site metrics.
Thanks for your question. The "Duplicate pageviews" error in the results are tied to Google Analytics firing twice on the same pages for the same UA number. Tag Inspector is capable of doing deeper validation for Google Analytics and can detect if a single Google Analytics Account (with a unique UA number) fires twice on any given page.
This is considered an error because typically a unique Google Analytics account should fire only once on pageload for any given page, as double firing/tracking would inflate pageviews tracked for that visit/visitor and severely impact site metrics.