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Change Object Material issue

Hi,
I tried to change a actor material at runtime, but issue.
As below image, this actor is fbx object and import at runtime,
the left white one is import fine, and right one is changed material but issue

the code is:

	FString name = GotActor->GetName();

	if (name.StartsWith("FBXMeshActor"))
	{
		TArray<UProceduralMeshComponent*> ProChildren;
		GotActor->GetComponents(ProChildren);

		for (int g = 0; g < ProChildren.Num(); g++)
		{
			UMaterialInterface* MeshMat;
			MeshMat = ProChildren[g]->GetMaterial(0);
			UMaterialInstanceDynamic* DynaMat = UMaterialInstanceDynamic::Create(MeshMat, this);
			DynaMat->SetVectorParameterValue(TEXT("BaseColor"), FLinearColor(1.0f, 0.0f, 0.0f, 1.0f));

			ProChildren[g]->SetMaterial(0, DynaMat);
		}
	}

My material parameter:
0512_2

What’s wrong?
Please help
Thank you