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IP lookup not showing router IP

I have an ASA 5510 and use NAT to translate to internal web servers.  On one web server all IP lookups show the external IP of the ASA.  On the other server for some reason when doing an IP lookup from that server it shows the address of the website hosted on this machine.  I have changed nothing in the way the routes go to this new server as compared to the other one.  For payment auth reasons this server needs to show the external address of the ASA, not the server IP.  I am not sure this is an issue with the ASA but wanted to see if anyone has run into this before.  The first web server has multiple sites hosted on it but when a request goes to the service provider it shows the IP of the ASA which the provider allows based on the IP of the ASA that we gave them.  The other server which does not show the ASA IP gets blocked because the IP it shows is not allowed by the service provider. 

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