They probably get it from njump.me

That site has a bug that prevents it from properly updating profile data, and it's also the most common provider of profile information to client apps.

I use nosta.me which looks amazing, and always has up to date data.

Additionally, I use metadata.nostr.com to update my profile and to create backups. If your profile ever gets fucked up, you can swiftly restore a backup to restore it in one click.