What does this mean?
It looks like you have several <title> tags on your page, you should only use one. The title tag helps both users and search engines to quickly understand what content they can expect to find on the page.
What to do?
If there are multiple title tags on the page, it may lead to search engines displaying the 'wrong' one, which in turn may lead to lower engagement or CTR from search results, and may also have an SEO impact.
It's possible to automatically fix this issue for WordPress websites.