Hidden H1 tags picked up by SEO checkers - how to remedy the error?

Hi all. I'm trying to track down a problem that SEO checker tools have flagged up. SEOspace and SEOability are telling me I have what seems to be duplicate H1 product titles.

After investigating the code and searching for H1 tags, I noted the following:

Example - https://www.karlinanderson.com/oppenwark/ring-holder-necklace

On line 1720
<section class="ProductItem-details ProductItem-details--mobile"> <h1 class="ProductItem-details-title" data-content-field="title">Oppenwark ring holder necklace</h1> </section>

on line 1760
<section class="ProductItem-details"> <h1 class="ProductItem-details-title" data-content-field="title">Oppenwark ring holder necklace</h1>

The difference is the “—mobile” part of the first line.

Any suggestions as to how to remedy the SEO error?

Thank you in advance for any help

Having multiple h1s won't affect SEO. You can see this video from Google

Thanks @tuanphan. I'm thinking the problem isn't just becuase there's more than one H1 tag, it's becuase the text is duplicated, the text is in the same physical location on the page and/or the text is 'hidden' (as per the attached SEOSpace screenshot).