I think it has something to do with the contacts list versions. 
nostr:note1uvywepqg0rz04d656kwf5yehgw39n2mz3stvqsfhtky398u9ek6qy55mrg 

 Another instance here.
nostr:note1sr00028pu4kh45g4cqeppsyka7q4r5em0h65csam4slyztag9m2qkkxz34