Icons Still Missing

Hello,

after updating the theme version 2.2 to version 2.3 not shown social networks icons of our header, not the buttons, nor the arrow to go up to the top, but that of the link arrow curiously slider. Reading the forum have seen that you have solved the problem with version 2.3.1, we do not fix the problem yet. We are working with a child theme, but we have only played 4 styles css and footer file. I spent the direction of development so you can see what happens to us:

http://inxthost.com/efiuap/

thank you very much for the help and look forward to your response