Sounds very unusual, for as much as people knock older versions of IE, they’ll usually display something. Can you post some of the code up, particularly the <head> section?
So which versions is it not showing in?
8 & 10?
Would seem odd that it works in 9 then.
I don’t know about anyone else, but I’m finding hits from anything earlier than 10 are extremely rare these days, so don’t worry too much about them now. And 10 is not exactly common.