Sub heading displaying next to main heading

I created a box that contains a main heading and sub heading. The sub heading is displaying to the right of the main heading instead of below it. Is there a setting I need to change so it displays properly?

Here is an example:
https://www.virtualcontentspecialists.com/do-you-know-your-competitors-holes/

https://www.ads-software.com/plugins/magic-action-box/