Pinterest Save button is not working

I wanted to include Pinterest "Save" button into my website and I did following steps :

1) I have included JS file :

<script type="text/javascript" async defer src="//assets.pinterest.com/js/pinit.js"></script>

2) Then I have included button into my HTML page :

<a id="pinterestShare" href="https://www.pinterest.com/pin/create/button/" data-pin-do="buttonBookmark" data-pin-custom="true"> <i class="fa fa-pinterest-p btn-social-circle-typo" aria-hidden="true"></i></a>

Problem is for the first time when I click to the save button it redirects me to Pinterest without any images and comments. Then I clicked "Back" button from the browser and again clicked on "Save" button then it started working. BUT if I restart my server the same issue it is not working without this above process. Any ideas why ? Thanks!

via Umidjon Urunov