The platform will let you know if it finds multiple H1's on a webpage.
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This isn't great for SEO as Google is only looking for one H1 heading, so having multiple H1's reduces it's effectiveness as a 'tool' for SEO.

The H1 you should keep should be unique to that page, be above the other headings (in page order) and contain your target keyword for that page.
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The others... you can remove them!