Child Actors removed during Play in Editor session but still there in the editor


I have some child actors in a blueprint and when I click on play in editor, they disappear. but when I end the session, the child actors are right there where they were. I don’t know what’s causing it at all, please help.

When playing, press F8, it will let play continue and you find these actors in the world outliner. Double click on one, it will take you there. ( I’m wondering if they moved ).

Apart from that, maybe they are marked as ‘hidden in game’?