Misunderstanding with the order of checking values

[Doppelganger]

Hello! I made a project in which I create enemy and detector at a given point during the start of the frame. When the player touches detector enemy is destroyed. But I do not understand why if I check first detector and then enemy, my condition does not work, but it's work if I check enemy first and then detector. Line 10 of screen. What do I need to know?