It's using a Hierarchical Deterministic architecture. The main idea is to avoid address reuse by deriving all keys from a master key and an index, so all previously generated key are valid.
This is normal for the Nano S to always have a different address.
Did you even read the thread/OP? Thats completely irrelevant.
Because i always thought i should be looking at the exact receiving address on the device itself.
This applys for the 'receiving' address of your nano s.
This is to ensure the private key which is necessary to spend funds from this address has been created by your nano s.
That step prevents malware from manipulating your screen (to mislead you into sending coins to that 'faked' address).
But how can i then know if i am sending to the right address, not the hackers address ( the februar hack address thing ) ?
You have to verify your address (when receiving coins 'to your nano s') to make sure it has been properly created by your device.
When sending coins you will have to verify the transaction details on your nano s.
If you always carefully check whether the details on monitor / nano s screen match, you are good to go.