VS Service Port and Pool Service Port Different

This is perfectly normal - the app may be running on any service port as a single server may be hosting multiple apps. As long as

Translate Address

is not set to disabled on the VS, the port will be changed to whichever port is configured on the pool member. The same del with the http monitor - it will target whichever port is specified for the pool member. You can set the Alias to a specific port if you want to but don't need to.

Imagine the case where you have multiple apps/virtual servers but only one backend server. You would listen on port 443 for all of the virtual servers but a different port on the backend server for each app.