Items Search Page Acts Different Browser to Browser?

Hello, I have created a beautiful new website using webassist and allot of help from Craig Rushforth. Now our site is live www.rainbowracing.com the search page is acting very strangely.
When viewing the search page using Safari on any of my Macs here, the page functions and returns item searches correctly. Now if I hop on over to any of the PCs in the office using Explorer 7 the page returns 155 items in my database regardless of what I type in for key word searches. I can use a name like Joe and it will return showing all items. On the Mac, if I type in Joe, I get a message stating that my search resulted in nothing being found and to try again, it works perfectly on the Mac and seems to have little function if any on the PCs. Why, oh Why oh Why is this happening? I have no idea what would cause this? PLEASE HELP!