Changes showing in FF4.0 but no other browsers?

I'm having a VERY weird problem, I have added a tabbed content style switcher on the right hand sidebar of my site but it's only showing up in FF4.0, all other browsers are showing the old version, I have tried cache clearing and everything but to no avail,

Screenshots: FF4.0b10:

Any other browser:

Anyone else ever experienced this?

Link: 开发者_如何学Pythonhttp://mutant-tractor.com

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After discussing this on SO chat, it appears that it's a problem with the host. It seems like a DNS propagation issue or an issue with their DNS servers. So it should be a temporal issue that should resolve itself after a while.

As far as how to fix it, as said in chat, the best way seems to be to find a new/better host...