Will multiple h2 tags hurt my SEO?
The Also Bought widget title is set by default inside an <h2> HTML tag.
Urban legend says that having multiple <h2> tags is bad for SEO, but that is not true.
Multiple <h2> tags are perfectly correct following the HTML5 specification and will not have any negative effect on SEO.
Summarizing his words, it is completely normal to have repeated headers if they structure correctly your store.