Not exactly the same problem, but no worries. I do see the Pinterest sharing button on your pages (though I also see you have only page titles published and no content on them). On the home page the button will only appear if you have posts on which it can appear. At present you don't have any posts, which is why you don't see it.
To control whether or not the button appears on individual posts and pages, look for the Likes and Shares module on the post/page editor.
To control whether the button appears on the home page feed instead of only on single post pages, go to Settings ->Sharing and look for and select:
Show buttons on __Front Page, Archive Pages, and Search Results