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Possible Cause:

You have customized System Master Page

Solution:

Option 1: Change/fix your custom system master page

Make sure topnav control/placeholder is above leftnav control/placeholder

Option 2: Change the Report.aspx to use v4.master instead of your custom master page

Edit file:
C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\14\TEMPLATE\LAYOUTS\WebAnalytics\Report.aspx

Find the following word:
DynamicMasterPageFile="~masterurl/default.master"

Change to:
MasterPageFile="/_layouts/v4.master"

This will force the analytics report page to use v4.master instead of your custom master page. Therefore your custom design will be gone while you open the analytics report page.