If you want to check rankings on Google, it is important that you are not logged in to Google. Google personalizes your search results which means that you do not get the same search results as other users. In order to ensure that you see the neutral results, you must be logged out of Google. We recommend installing the Google browser "Chrome" and opening a so-called incognito window to get neutral search results: https://support.google.com/chrome/answer/95464?hl=en
You could also use Google's Ad Planner Tool (to simulate ads and organic results) which provides an accurate comparison with the results you're getting in SECockpit.
When you compare the Top 10 results shown in the SECockpit Keyword Detail view with the search results for the same keyword on Google, the differences can also be in our caching mechanism.