font awesome icon rendering then disappearing in Chrome

I'm building a personal website, https://stark-ridge-41061.herokuapp.com. There are several icons for GitHub, SO, etc. One of the icons is for linkedin, but for some reason, the linked in icon shows up for a split second then disappears, and only in Chrome. I'm not sure if it's important, but when the page renders in Chrome my fa-indeed element does not have a ::before tag like all my other fa-icons.

I have tested it in Firefox and all the icons shows up correctly. What is wrong with my code currently to make it behave this way in Chrome, and what can I do to fix it?