Map editor needs a fix

Would love to publish my map I made but when picking and placing enemies ounce you change the selection of enemy it changes every enemy placed when selecting different enemies.
Example being… I place multiple juvie but now I want to switch that spot with a warden for a boss fight at the end but now every juvie at the beginning has turned into a warden… please fix this so I can actually beat the beginning of my map. Lol