I've never seen this before, but my product pages started overlapping my header. Just product pages. This began while I was adding a page with elementor (an exact replica of another page) and adding a product (a duplicate of another product). Nothing different. Nothing in any code editors. I don't usually use elementor (prefer classic text editor) but I haven't had issues when I've used it before.
I added padding to my site in custom CSS, but that causes all regular pages to have padding above the header.