I need Sherlock Holmes ( or someone ) to help figure this out ....

situation
I use shared hosting wherein the URLs are matched to a folder in my host
I have 2 unique domain names, both point to the same folder (RIEco)
(Ravenswood.co and TheRavenswoodGroup.com)
worked perfectly for a couple of years
rebuilt the site using XARA Pro and FTP all files into the same folder (RIEco)
while testing the past few hours
I noted an anomaly
when I hit a hyperlink to an outside URL (unrelated to Ravenswood)
it still showed www.TheRavenswoodGroup.com in the URL for the visited site?????
Attachment 125813
and If I go into Ravenswood.co and click the same link - it works normally
upon more research
the view source for www.TheRavenswoodGroup.com
shows a FRAMESET????? but Ravenswood.co does not?? HOW IS THAT POSSIBLE? (yo sherlock)
as BOTH URL point to the same page
moreover - here is the view source for TheRavenswoodGroup

Code:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> <html> <head> <title>The Ravenswood Group</title> <meta name="description" content="The Ravenswood Group is an International Holding Company with dozens of global partners and affiliated companies."> <meta name="keywords" content=""> </head> <frameset rows="100%,*" border="0"> <frame src="http://www.ravenswood.co" frameborder="0" /> </frameset> </html>

how does "TheRavenswoodGroup" even know about "Ravenswood.co"???
I opened the index.html (made with XARA) in an editor and there is no frameset coding

If I go to www.topgun.com/RIEco (the actual location of the files)
it works as expected (ie no frameset)

FYI
the foregoing is not a deal-breaker for me
I doubt anyone in the real world will even notice
BUT
sure 'need' to see how this happen as might be an issue in the future
sorry for the long read = hopefully, some might find it interesting help cipher this
in summary
two domains USING the EXACT SAME Xara files have different results
and yes - did look at my LINK CODING -- in XARA (is normal)
Attachment 125814