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I have got an double H1 in the HTML

For my website i use a different H1 for mobile as for the PC.
My SEO Specialist tells me this (and he’s right). In the HTML code you can see the Double H1. I thought when its hidden on iPhone, its not visible on the html. But it is…

Whats the best solution for SEO now?
Make the Mobile H1 an H2?

I think the best ting would be to use only one H1 and style this the way you like on mobile rather than using separate titles. Is there a particular reason you are using different titles?

Thank you perkristian for giving an answer on this.
The difference is thats it in a seperate “Mobile” Section…
a complete other style… the H1 Tittle is the same “Text”