reseller - 8:31 pm on Mar 7, 2012 (gmt 0)
Do you see big differences in rankings on google.com and google.ca ? because that doesn't necessary means your site is pandalized.
I see also different SERPS on many different international Googles. Accordingly we may expect sites to rank differently on different international Googles. And that might explain why some people get "undesired" international traffic sometimes!