Hello Josiah,
The reason why it doesn’t appear is because there is escaping & sanitization enabled on text fields.
Meaning if you enter HTML code in a text field it will remove all HTML characters.
You will need to edit the call-to-action.php file located in the sections folder.
You will find the following code;
esc_attr($parallel['calltoaction-btn1-text']);
You will need to change it to;
wp_kses_post($parallel['calltoaction-btn1-text']);
Let me know if that doesn’t work.