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This is normal in many proxy and VPN setups. Seeing Android does not mean your PC is being detected as an Android device. A TCP/IP fingerprint does not read your operating system. It guesses, based on the shape of the network traffic:
  • Packet size, or MTU
  • TCP behaviour, such as window size and flags
  • TTL, the time-to-live value
Because the traffic reaches the checker through our gateway, those values reflect the network path rather than your machine, and the tool’s guess can land on a different operating system. The result is an inference, not an exact detection. Browser-level identity is set by your browser or anti-detect profile, not by the proxy. See Can I specify the fingerprint on your proxies?.