Stale content has a habit of resurfacing through search engine caches or...

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

Stale content has a habit of resurfacing through search engine caches or forgotten site archives, often confusing users and diluting your authority. If you’re seeing outdated pages pop up in rankings, it’s time for a technical cleanup