Duplicate H1 on another page
What this means
Another indexable crawled page uses the same H1 text. The H1 is the strongest on-page topic signal, so repeating it makes two pages claim the same subject.
How to fix it
Give each page an H1 naming what only that page covers, or consolidate the pages and redirect the weaker URL.
Fix effort
This check needs review: the change can be drafted for you, but a person has to approve the wording or choose the target before it ships.
Authoritative source
https://developers.google.com/search/docs/appearance/structured-data/article
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