Hi, @c, welcome to the community!
In order to transfer a repository to someone, the user needs to inform the Workspace ID of the user to whom they want to transfer the repository, so you must have a Bitbucket account to receive any repository transfer. Checking the Bitbucket account linked to the email you used to create this question, I can see it was created in 2013.
This means someone is trying to transfer some repositories to you. Maybe the user who is offering the ownership of these repos added the wrong workspace ID when transferring them.
In any case, if you don’t want to accept this transfer, you can open View transfer request > select Reject.
I hope this clarifies the situation, but please let me know if you have any additional questions.