Load Blueprint as UChildActorComponent,but show incorrect?

Development Programming & Scripting Blueprint
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1

I use C++ to load a blueprint as UChildActorComponent,code as blow:

UBlueprint* BP1 = LoadObject(nullptr, TEXT(“/Game/Common/VisualReality/SteamVR/Blueprints/VRUI/UpStair”), nullptr);

UChildActorComponent* UpStair = CreateDefaultSubobject<UChildActorComponent>(TEXT("UpStair")); 
UpStair->SetRelativeLocation(FVector(0, 0, 170));
UpStair->SetupAttachment(GetRootComponent());
    if (BP1 != nullptr)
	UpStair->SetChildActorClass(*BP1->GeneratedClass);

Show in BlueprintEditor:

211710-tim截图20170831152101.png
211710-tim截图20170831152101.png690×503 113 KB

But Show in Viewport:

211721-tim截图20170831152219.png
211721-tim截图20170831152219.png608×621 254 KB

hope somebody can tell me why or fix it! thanks!

Chinese Describle:
加载一个蓝图类作为UChildActorComponent,在Umap场景中显示出问题了，在BlueprintEditor中显示正确，而且如果直接拖拽一个蓝图类到BlueprintEditor,然后加到场景中是正确的！是加载的问题还是什么原因呢？