Okay so a few things. This ^^ Happens when you try to get a reference to something before it’s fully loaded in. Running GetActorOfClass is gathering a collection of references- so it’s because they’re not loaded in yet. Put a delay there to wait a moment before gathering the refs and it should guarantee it. 
I think a lot of your issues may be based around loading in- if you’re attempting to reference something before it’s loaded in the BeginPlay, it’ll just fail because the thing you’re referencing doesn’t exist yet.
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