For now I have project with two entities: Account and Profile, with relation one-to-many – one account can have multiple profiles. For now I have several instances of accounts and profiles, some of accounts have several profiles.

I want to know what would happen with those profiles, which are bounded to same account if I change relation to bidirectional one-to-one.

UPD:

I changed, and for some reason all profiles are present and bounded to account. I was expecting, that there will be left only one profile to one account.
Please explain why 🙁