Thank you for the helpful comments. Both of you are right. The red was overexposed. I've got to admit to some inexperience here. To learn more, I just went through more than 50 RAW images in LR from this particular shoot. Many were slightly overexposed. My exposure compensation was set to 0.0. I will change that to -0.3 and try again.
I also noticed that a number of my images were clipped at both ends of the spectrum in high contrast situations. I'll use the shadow and highlights slider to correct. However, in scenes such as this, is it better to properly expose the highlights and let the shadows fall where they may?