Results of an investigation into anomalous Ca II blueshift between different model runs. In panel (a), it can be seen that forward models that include absorption due to Sc opacity yield a larger Ca II blueshift than models that lack Sc (Fe Doppler shift is included for comparison). Panel (b) illustrates the cause of this anomalous blueshift: an Sc line overlapping one line in the optical Ca II doublet. These results imply that overlapping line profiles can subtly contaminate calculated Doppler shifts.