'App running in AWS EC2 has been seen under different client IP while connecting to different servers. Why?

I have 2 servers running in my own hosting: auth-server and application server. Auth server issues an auth-token for application server. Application server checks issued token and client ip (it must match ip that was used to get the token). In majority of cases it works OK but not when client is in AWS EC2. For some reason client IP (how client is seen for my servers) changes when client is located in AWS EC2 instance. Is it normal situation that AWS can use different network interfaces to connect to different servers?

ip


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