Legacy content has a habit of resurfacing through forgotten site archives,...

https://www.scribd.com/document/1016381165/Why-Do-Old-Content-Problems-Show-Up-at-the-Worst-Possible-Time-205018

Legacy content has a habit of resurfacing through forgotten site archives, often confusing users and hurting your SEO. This ghost traffic is usually a sign of outdated pages lurking in search results