PILLAR 2, TOPICAL CONTENT · 2.1 Title & metaHighVerified
Multiple <title> tags
What it is
More than one title element.
Why it matters
Ambiguity; Google picks one, maybe not yours.
How to fix it
Emit a single title.
Impact
Medium-high. Direct.
Evidence
Use one clear title per page. Google Search Central, SEO Starter Guide