Server Setup

[Former user]

I have two upstream look like this

upstream api {
   sticky name=app expires=2h;
   server 10.3.223.32:80;  <-- Server 1
   server 10.3.223.33:80;  <-- Server 2
}

upstream backend {
   sticky name=app expires=2h;
   server 10.3.223.32:8010;  <-- Server 1
   server 10.3.223.33:8010;  <-- Server 2
}

Im testing with my app (in my phone) call both of them upstream above. I saw in upstream api, request into server 1 but in backend upstream, request into server 2.

How can all the requests from the same place are pointing to the same server with two upstream