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Masquerading does not hide internal IP addresses

Hi all,
My setup:
Firewall: Debian Potato, kernel 2.2.17, ipchains with masquerading
Internal: Mix of Windows 98, Windows 2000 and Linux 2.4.x.
My problem:
I connected to a site somewhere a while back (can't remember which) to buy something and during the billing process it came back with a message saying that it was logging my IP address (no problems with that) but it showed my external AND internal addresses. This intrigued me so I tried it from a different internal address and it definitely got it right.
My question:
I have checked through some of the documentation available and I can't see where this information could come from, so
1) How does this work?
2) How do I block it?
   __ _   Debian GNU User   Simon Martin
  / /(_)_ __  _   ___  __   Project Manager
 / / | | '_ \| | | \ \/ /   Milliways
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