Not sure I understand "From 1st Nov, SiteCatalyst report suites are migrated to v15 platform " because we have been using V15 since January 2013.

Thanks for the reply. However we haven't done any implementation changes so I am not sure about that.

We use both Google Analytics and Site Catalyst V15. Recently we have seen a big discrepancy in visits. We are experiencing extra 12-15% visits in Site Catalyst compare to Google Analytics. Historically, we saw around 4-5% difference, which is acceptable . Is there any reason for this increase?