We have checked your site, it seems that on your Site’s home page there is no ShareThis buttons are present instead “AddThis” buttons are present and on other page only ShareThis Email Button is present which is on the floating bar at the left.
Below is an example for the simple span tag for Pinterest and LinkedIn buttons –
<span class=’st_pinterest_large’ displayText=’Pinterest’></span>
<span class=’st_linkedin_large’ displayText=’LinkedIn’></span>
In the same way you can add other buttons.