Re: piwik proxying miss counts

I just tried using 2 piwik trackers tracking the same blog using synchronous method as in the FAQ.

So the the connection is
User -> Proxy -> My Piwik Server
-> My Piwik server
User downloads the piwik.js from Proxy, and it's supposed to be tracked in the server with 2 separate ID. I observe that the Proxy method does under report. So the user download the piwik.js from the Proxy, but it doesn't hit the piwik.php in the Proxy.

Any clue so I can debug this further? Thanks.