Multi Sphere Trace for Objects is skipping objects in array

Hi guys, I am very new to UE4 and game design/programming. While following a tutorial https://www.youtube.com/watch?v=06mK0JCS6Vw&t=890s to build a Tower Defense games I came across and issue where Multi Sphere Trace for Objects only fires at objects after one is destroyed and second enters the sphere area. Meaning that, if one runner spawns in a second, then it will only shot at every second object.

I have a branch after the Multi Sphere Trace for Objects node and it always return False. I am just very puzzled about solution and have been spending hours to debug, but I have exhausted all my options at the moment.