Are you only seeing one featured job display on your featured job widget? This could be a couple things, either you have not selected more than one featured job, ensure you have more than 1 featured job, select the option shown in the screenshot below inside of your job postings and publish/update the job posting.
The other main reason could be because you are hosting with WPEngine, by default they disable the feature in WordPress that displays random results.
Go to your WPEngine dashboard settings, scroll down and enable the random functionality.