Occasionally, through the use of the Pinterest Integration feature for Pro Blogger you will find that the default Pinterest Pinit on your Article/Blog page is changed from the themed custom button.
to the same style as your image Pinit buttons.
To correct this will require editing of the code that provides this Pinterest button. You can usually find this in either the article.liquid or article-template.liquid file, it may vary depending on the theme you are using. Once you have located the code for the button (search for Pinterest) - you need to add the following property to the link button. data-pin-custom="true" As per the example below.
Simply save the file and now when the Pinit buttons are applied to your images - this button will now be ignored.