Google Analytics discrepancy on outgoing clicks

Client says he receives less clicks than reported by my Event report

[hairycoo]

I am tracking outgoing clicks to a client site using event tracking. When I go to Outgoing links+Click category I have 165 unique events recorded.

They also use analytics and when they go to Referring sites>My site they get a lower number of clicks (135) than those reported by my Event report.

Can anyone help explain what could cause this?

[jcoronella]

Your outgoing tracking is using javascript events added to outgoing links.

Their incoming tracking is using the referer string from the browser.

Both have errors and are not supported 100% of the time. A lot of browsers can be set to disallow referers, and javascript redirects can block them too.