Doom builder 64EX

When editing in doom builder,(specifically for doom64EX)I seem to have trouble with placing enemies on my map. I can place objects, but monsters will not appear in game. It shows the monsters in the editor but when I test the map they are just not appearing.

things Ive tried to fix the problem:

Made sure to start the game with monsters.
They are set for every difficulty.
Reloaded the resources.

Could this just be an issue with the program or doom engine?

*using doom64EX 2.4*

Your editor might be configured to not show monsters during testing. There should be an option for this. Look for a small arrow next to the 'test map' button and it should display a drop down list of choosing difficulty as starting the map with or without monsters.

Yes I made sure to do thay. Still nothing

IF you have it set to load with monsters, the other thing that might be hindering is the monsters themselves aren't flagged for the appropriate difficulty.