The Problem:

Making builds in unreal engine isn't too bad. Though every so often you come across a problem that just is odd, or not something you can easily figure out. We had an issue where in the build enemies were not spawning yet in the engine they would. We tried so many different things. Breakpoints, UE_LOGs and multiple people reading over code and trying different values for spawns. 

The Solution:

In the end it was a simple fix. We were using a return statement in a loop, and it was exiting the function without updating an Array we were using to store enemies. So when we changed the return to a continue it made it so, for some reason, if it doesn't spawn the right amount of enemies it will at least have the correct number of enemies you have to defeat to progress in the game. After making that change we had no issues with the build and were able to full complete the current build.