Hi
In your screenshot you did not select any identity state. Can you validate what is the identity state that you have on the identity. As you have not configured this identity state would be Active.
check this post
As the identity state is active you might have a role/entitlement attached as Gourab mentioned and that would have triggerred the account creation.
Also validate if the lifecycle state is changing to active. If that is the case then your configuration on active lifecycle state might trigger account creation.
Thanks,
Uday