'My Sites' section

Hi, for the 'My Sites' section, the toolbar rightly fully just used to show the user's sub-sites.

However, now when I hover over 'My Sites' it has a link to the admin site too and worryingly the dashboard of the admin site (although they cannot gain access).

Can you let me know how to change this so that users can only see their own sites on the 'My Sites' menu bar drop down.

Thanks