Social Media Icons In Header No Longer Displaying Correctly

Hello,

I recently changed my primary domain from weathertogether.us to weathertogether.net. Since the change, the social media icons in the header no longer display correctly – they show a rectangle instead of the correct icon.

Clicking on them still sends me to the right place, and I’ve noticed that other links that I haven’t changed also have this problem: ex https://weathertogether.net/weather-links/

Does anybody know what I can do to make the icons display correctly again?

Thank you in advance,
Charlie