Thanks for letting me know! I was able to get the share buttons to appear on both Chrome and Firefox on the first try. I've also tried the example URL you gave me: http://gifsec.com/funny/tag/what-the-fuck-reaction-gif/page/4/. It seems to be working just fine. I've also had my dev team try it out on both Windows & Mac operating systems and it seems to be working on every browser.
I've noticed on your screenshots you have an Ad Blocker enabled on your page. In some cases, this may cause a conflict with the share buttons working properly. Can you try disabling the Ad Blocker, refreshing your browser, and seeing if the buttons appear? I just want to make sure we get to the bottom of this.
Thanks for your help!