I have a weird bug

I created moving tiles that I want to spawn in once my game starts and when i press play i get this weird bug where a second tile appears out of nowhere and starts moving as the original tile goes back to its starting point.
video evidence: Desktop 2021.08.26 - - Google Drive

the code that i think is the issue:

void AFloatingTiles::Tick(float DeltaTime)

	if (bInterping) {
		FVector CurrentLocation = GetActorLocation();
		FVector Interp = FMath::VInterpTo(CurrentLocation, EndPoint, DeltaTime, InterpSpeed);

			float DistanceTraveled = (GetActorLocation() - StartPoint).Size();
			if (Distance - DistanceTraveled <= 1.f) {
				if (bSpawning) {
					bSpawning = false;
					FActorSpawnParameters SpawnParams;
					SpawnParams.Owner = this;
					AFloatingTiles* NewTiles = GetWorld()->SpawnActor<AFloatingTiles>(FloatingTiles, StartPoint, Rotation);
					NewTiles->StartPoint = FVector(0.f, 0.f, 0.f);
					NewTiles->StartPoint = FVector(100.f, 100.f, 100.f);
				GetWorldTimerManager().SetTimer(InterpTimer, this, &AFloatingTiles::ToggleInterping, InterpTime);
				SwapVectors(StartPoint, EndPoint);