There is no confusion about these messages at all.
Rather it was confusing before because it was only having one message " In Process"
Now, they have more organized about these messages and they have provided stage by stage messages so one can understand at what stage application is.
1. 1st message shows that your initial application was received by Sydney and initial review was completed.
2. 2nd message shows that after you submitted your all documents to Buffalo office, your application is received by the Buffalo visa office and now it is pending for 2nd review.
Let me know if it sounds good to you
canadp