Welcome to the Q&A Forum

Hi there Don't block pages or directories because they have duplicate/missing titles - instead, fix them - those pages may provide value and you could be missing some big opportunities. "...we can leave things as is without worrying about the page being de-ranked/penalized." - you're blocking the page in your robots.txt, so you're already not being indexed. If you are looking to index these pages, you need to remove that robots.txt. Go through, assess your titles and page content, and change your titles to be uniquely relevant to the content on that page. If you have the opportunity as well, do a content audit to see if pages can be condensed or expanded. Hope this all helps! Good luck!

On the page you cite you have a tag which could be causing the error: <title>Heat Press, Transfer Machine Comparison Chart For<strong><br></strong>Hix, Geo Knight, Stahls Hotronix, Maxx, Insta, Panther & More!</title>