Hi Aimee,
It seems like its a Page Builder Issue. Open your page using Elementor Page Builder by going to Pages in your WordPress admin. After you open your page in Elementor page builder, select the icon box on the page. Now you will have 3 tabs of that Icon box setting ie Content, Style and Advanced. Click on the Content tab and under Icon box section there is a setting called Shape. Select
circle from the drop-down.
Let me know if this works for you
Best Regards