Will multiple h2 tags hurt my SEO?
The Frequently Bought Together widget title may be set 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.
You can see a detailed discussion on the issue at https://moz.com/community/q/h2-tags-can-you-have-more-than-1-h2-tag and a response from Google at https://support.google.com/webmasters/forum/AAAA2Jdx3sUuO6QnrM1Iu4