Be sure you pick the right enemies. Look for terms like Assaulter, Berserker, Brawler, Defender, Heavy FlammerPistolero, Rocket, Sniper to tell which weapon they're carrying.
Also, enemies won't see you nor spawn in waves when you're playing the map in EXPLORE mode. Exploring is designed to test the level without the enemies interacting with you.
Instead, you should try the map in PLAY mode, so the AI will interact with you.
On PC:
Explore mode = CTRL+E
Play Mode = CTRL + P
You can also start Play Mode straight from your player Spawn Point's Object Preferences.
On console: press (“X”) to open object options, then select custom properties and click "Play from here" or something.
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