The object is not moving correctly

I set 4 keys to move. And when I press up and their object moves normally. And when I press left and right, it also somehow moves up or down. And I don't understand what's wrong

Code:

FVector2D WSAD;
void ACamera::FMove(float Button)
{
    int32 Key = Button;
     switch(Key)
     {
        case 1:
            if (WSAD.X != 1) 
            {
                WSAD = FVector2D(0, 0);
                WSAD.X = -1;
            }

        break;

        case 2:
            if (WSAD.X != -1)
            {
                WSAD = FVector2D(0, 0);
                WSAD.X = 1;
            }
        break;

        case 3:
            if (WSAD.Y != -1)
            {
                WSAD = FVector2D(0, 0);
                WSAD.Y = 1;
            }
        break;

        case 4:
            if (WSAD.Y != -1)
            {
                WSAD = FVector2D(0, 0);
                WSAD.Y = -1;
            }
        break;

     }
     if (Player)
     { 
         Player->DirectionMove = WSAD; 
     } 
}