Service Icons Appearing Incorrectly on Home Page

While my website was in development, I accessed it in the wp directory of my main domain. When it was ready, I had an addon domain point to the wp folder, and the website is visible at the addon domain. Since doing that, the service icons on the home page do not render correctly in Internet Explorer, Firefox, or Chrome (a slightly different error in each browser). Also not rendering correctly are the icons for address, telephone, and email in the “Contact Us” portion of the footer. Does anyone have an idea about how to correct this (hopefully short of starting over)? By the way, the site appears correctly in the wp directory I originally worked with.

In development: https://gbcministries.com/wp
Final form (with icon errors): https://birminghambibleinstitute.org