Global Traffic Manager Serving wrong IP for Virtual Server

Further information: My GTM appears to be doing a NAT (or similar). I have deleted the above configuration and added a completely new WideIP test.company.com, with a single pool/server/virtual server with address x.x.x.200. When I query this from the problem GTM I receive the .208 address, but from other GTMs (replicated) I receive the correct .200 response. Appears this single GTM has some configuration somewhere which is translating .200 to .208 (I've checked all the areas under Local Traffix->Address Tranlation and all show as empty). Where could this NAT be coming from?