Heading Tags

Hi there, I noticed these tags on my page (www.tubz.com/tubztalk): <h1 class="assistive-text">Primary Menu</h1> <h2 class="screen-reader-text">Post navigation</h2> <h3 class="screen-reader-text">Post navigation</h3> Seems like a waste of title tags. Any way to change them. Thanks for your time! www.tubz.com/tubztalk