Why is there a "default" 2 pulls for every new repository?


I am very surprised to see that my test repositories were pulled by others. So I created from scratch a fresh new public “docker-whale” repository (my favorite one) and, some seconds after the end of this push, 2 pulls were added (I see this figure on docker hub web).
Is there any way to see who did these pulls ? Is it an automated thing (like pull for backup) on docker hub side ?

Best regards,