Ghost blog theme Casper - social sharing buttons are missing

After migrating to Ghost 1.0 and Casper 2.0 (I'm actually on Ghost Version 1.13.0 and Casper Version 2.1.4), social sharing buttons are completely missing.

At first I thought they had been removed from the theme, since they usually have been on the footer. Instead they are inside an hidden floating-header div on the top of the page that is hidden by default, and should become visible after some scroll on the page.

It seems to be a javascript conflict that prevents the function that change the CSS from running.

After some searching, I discover the problem was a conflict with the jquery <script> tag left in the Code Injection screen since Ghost 0.7 version.

Just remove the jquery <script> tag to fix the problem and have back the floating-header div with social sharing buttons.