Discrepancy between blueprint Text Render Component and UTextRenderComponent scales

Hi am trying to convert a blueprint (Default scene + 2 Text render components) into cpp.

In my blueprint,
The default scene scale is 1,1,1
The first Text Render Component scale is 1,1,1 with XScale=0.5, YScale=0.5 and WorldSize=26
The second Text Render Component scale is 1,1,1 with XScale=1, YScale=1 and WorldSize=26

Now when for my cpp I have:

AInGameTextMainSystem::AInGameTextMainSystem()
{
	// Set this component to be initialized when the game starts, and to be ticked every frame.  You can turn these features
	// off to improve performance if you don't need them.
	// PrimaryComponentTick.bCanEverTick = true;

	// ...

	//Initialize components
	//Create the Scene Component and set it as the root component
    DefaultSceneRoot = CreateDefaultSubobject<USceneComponent>(TEXT("DefaultSceneRoot"));
	DefaultSceneRoot->SetRelativeScale3D(FVector(1.0f, 1.0f, 1.0f));
    RootComponent = DefaultSceneRoot;
	
	
	// *********************************
	// *** Setting Round number text ***
	// *********************************
	UTRC_RoundNumber = CreateDefaultSubobject<UTextRenderComponent>(TEXT("UTRC_RoundNumber"));
	UTRC_RoundNumber->SetupAttachment(RootComponent);

    // Optionally, set some default properties
    UTRC_RoundNumber->SetText(FText::FromString(TEXT("Round 1/10")));
    UTRC_RoundNumber->SetHorizontalAlignment(EHTA_Center);
	UTRC_RoundNumber->SetVerticalAlignment(EVRTA_TextCenter);
    
	//UTRC_RoundNumber->SetWorldScale3D(FV_RoundNumber);
    static ConstructorHelpers::FObjectFinder<UMaterial> UM_RoundNumberMaterial(TEXT("/Game/GameInfo/AudioWide_M_TEST3.AudioWide_M_TEST3"));
    if (UM_RoundNumberMaterial.Succeeded())
    {
        UM_RoundNumber = UM_RoundNumberMaterial.Object;
        UTRC_RoundNumber->SetMaterial(0, UM_RoundNumber);
    }
	else
	{
		UE_LOG(LogTemp, Error, TEXT("UM_RoundNumberMaterial NOK"));
	}
	
	static ConstructorHelpers::FObjectFinder<UFont> UF_RoundNumberFont(TEXT("/Game/Menus/fONT/FG_AudioWide/FG_Audiowide-Regular_Font.FG_Audiowide-Regular_Font"));
    if (UF_RoundNumberFont.Succeeded())
    {
        UF_RoundNumber = UF_RoundNumberFont.Object;
        UTRC_RoundNumber->SetFont(UF_RoundNumber);
    }
	else
	{
		UE_LOG(LogTemp, Error, TEXT("UF_RoundNumberFont NOK"));
	}
	// Set the text render color
    UTRC_RoundNumber->SetTextRenderColor(FColor::White);
	f_RoundNumberXScale = 0.5f;
	f_RoundNumberYScale = 0.5f;
	f_RoundNumberWorldSize = 26.0f;
	FV_RoundNumberLocation = FVector(0.0f, 0.0f, -100.0f);
    UTRC_RoundNumber->SetXScale(f_RoundNumberXScale);
    UTRC_RoundNumber->SetYScale(f_RoundNumberYScale);
    UTRC_RoundNumber->SetWorldSize(f_RoundNumberWorldSize);
	UTRC_RoundNumber->SetRelativeLocation(FV_RoundNumberLocation);
	UTRC_RoundNumber->SetRelativeScale3D(FVector(1.0f, 1.0f, 1.0f));
	// *********************************
	
	// *********************************
	// *** Setting Score number text ***
	// *********************************
	UTRC_Score = CreateDefaultSubobject<UTextRenderComponent>(TEXT("UTRC_Score"));
	UTRC_Score->SetupAttachment(RootComponent);

    // Optionally, set some default properties
    UTRC_Score->SetText(FText::FromString(TEXT("0 : 0")));
    UTRC_Score->SetHorizontalAlignment(EHTA_Center);
	UTRC_Score->SetVerticalAlignment(EVRTA_TextCenter);
    
	//UTRC_Score->SetWorldScale3D(FV_Score);
    static ConstructorHelpers::FObjectFinder<UMaterial> UM_ScoreMaterial(TEXT("/Game/GameInfo/AudioWide_M_TEST3.AudioWide_M_TEST3"));
    if (UM_ScoreMaterial.Succeeded())
    {
        UM_Score = UM_ScoreMaterial.Object;
        UTRC_Score->SetMaterial(0, UM_Score);
    }
	else
	{
		UE_LOG(LogTemp, Error, TEXT("UM_ScoreMaterial NOK"));
	}
	
	static ConstructorHelpers::FObjectFinder<UFont> UF_ScoreFont(TEXT("/Game/Menus/fONT/FG_AudioWide/FG_Audiowide-Regular_Font.FG_Audiowide-Regular_Font"));
    if (UF_ScoreFont.Succeeded())
    {
        UF_Score = UF_ScoreFont.Object;
        UTRC_Score->SetFont(UF_Score);
    }
	else
	{
		UE_LOG(LogTemp, Error, TEXT("UF_ScoreFont NOK"));
	}
	// Set the text render color
    UTRC_Score->SetTextRenderColor(FColor::White);
	f_ScoreXScale = 1.0f;
	f_ScoreYScale = 1.0f;
	f_ScoreWorldSize = 26.0f;
	FV_ScoreLocation = FVector(0.0f, 0.0f, 0.0f);
    UTRC_Score->SetXScale(f_ScoreXScale);
    UTRC_Score->SetYScale(f_ScoreYScale);
    UTRC_Score->SetWorldSize(f_ScoreWorldSize);
	UTRC_Score->SetRelativeLocation(FV_ScoreLocation);
	UTRC_Score->SetRelativeScale3D(FVector(1.0f, 1.0f, 1.0f));
	// *********************************
	
}

Which results in:

I don’t manage to understand why they are different in scale. If you think you know why please tell me (Please note the result is the same even if I drop all the SetRelativeScale3D)