I interviewed at both places. from what I understand, they are two different admissions office. They look at your file separately. Many people interview at both places and get in.
The only time it would affect your admissions, is if you accept to one place or the other and made a deposit for your seat. So if you accepted at Erie and made a deposit they would drop your file at Bradenton and vice versa.
The alternate list and wait list is the same thing. It gets a little confusing because it gets used interchangeably.
I spoke with the admissions staff at Erie and Bradenton, they tell me that they begin to rank alternate list around the last week of May.
I'm assuming with the given time line that alternate list candidates will start hearing from the admissions staff soon after that. Its very important that you send in any updated transcripts and any new information that they may need. Check your portal, there should be a list of things that they will need from you now.
It looks like they are wanting updated Transcripts from me. They were also waiting to receive the alternate letter back stating that i was still interested. Check your portal to be sure.