Multi-site / same url shows different page depending on the browser

I have a few Drupal sites installed...Each of them used to have its own Drupal files.

Today, I decided to regroup two of them in only one Drupal installation (Each one keeps its own database)
The main site is www.TheBaySoccer.com and the one I wanted to use the same files is www.yoursoccersite.net

I made all the necessary modifications (Create a subdirectory in sites/default, redirect the domain to the main Drupal installation folder, move the custom modules, themes and files folder, etc...) Things worked perfectly as long as I was using Firefox...Then, I tested www.yoursoccersite.com on IE and Chrome....The home page shows TheBaySoccer on these 2 browsers. If I change the URL to www.myteamsite.net/node, then I get the right page in any of the 3 browsers.

I think I am missing something. Maybe a reference to the old path in the database?

I contacted my host explaining the problem and asking them if there was a chance it had something to do with the server configuration...Their answer was not very satisfying:

"There are many reasons why a web page may not be visually consistent. If you added any CSS code, Iframes. nested tables, special fonts, widgets / gadgets, formatting characters and user text settings with different browser preferences, all of which can have different effects on different browsers. Sometimes, it gets so bad that the web designer will put a special logo stating that “this site is best viewed by using … browser”"

If anyone knows about this issue, please let me kmow...Thanks for your help!