Carnies below 40 may not spawn properly for heroes.
A possible solution may be to set your mission for 40+ and see if that works.
Eva Destruction AR/Fire/Munitions Blaster
Darkfire Avenger DM/SD/Body Scrapper
Arc ID#161629 Freaks, Geeks, and Men in Black
Arc ID#431270 Until the End of the World
Well, I was in test more on a Hero when it worked, and on a villain after publishing it. But I will try and see if that helps.
How 'bout that, it worked! Thanks so much! 
I don't really like the second mission being 10 levels higher than the other missions, but I prefer it having enemies in it.
At some point, the second mission of my MArc just stopped spawning Carnies when you play it.
They're selected as the enemy group. The mission is within their level ranges. They show up when I test the arc, but not when I publish it.
Anyone had this issue and know how to fix it (if there even is a fix)?