If your page's and tags match, the latter may appear over-optimized

Hello!

I have the following warning from a site audit i did.

If your page's <title> and <h1> tags match, the latter may appear over-optimized to search engines.

And it is true that on my product pages the element <title> and the element <h1 class="product_title entry-title"> share the same exact title.

The <h1 class="product_title entry-title"> i know is coming from what i type in the backend of the product, but i don't know where the element <title> is coming from.

I thought you would be able to enlighten me, so i can maybe differentiate them.

Example:
Product

P.S. Search the elements on browser inspector to quickly figure out, which elements i am talking about!