Hi! There are one of two things happening here. Either you have selected 'main index' within your menu placement settings, which does control the toggling of bookmarks on the typical home feed for a blog, OR you have a special theme that uses custom post types to display your featured content on a static home page.
If your theme uses the standard blog feed, unckecking 'main index' under your menu placement settings will do the trick. However, if your theme uses custom post types for home page excerpts, this becomes a little trickier. You will need to use 'manual mode' to control where SexyBookmarks are displayed in your blog's content types.
Please, see the following article for more information: http://support.shareaholic.com/customer/portal/articles/668180-sexybookmarks-and-custom-post-types