All my controllers are being called twice.

[eluser]mddd[/eluser]
You're saying it only causes problems in Chrome. Is the double calling also happening in other browsers or just in Chrome?
I agree with WanWizard, it might well be an image or something like that. Specifically, might it be that you have not stopped url rewriting for favicon.ico?
It seems (from what I've read) that other browsers 'remember' better when there is no favicon.ico, while Chrome tries to find it every time.