There is an issue with some older DCC control software where the number is offset by 5, this is a known issue with Lenz and Z21, the software needs to be updated to get rid of the issue, so address 1 => 5, 2 => 6 etc, so everything might still be working perfectly, its just the numbers need shifting up by 5 to make them work. It worked on several layouts I have built, although you do need to reprogram them all if you upgrade the DCC controller software. Hope this helps