In the anoboard, why am I seeing two different scores in what seems like a single, continuous anomaly?

This is the default behaviour for "change direction" anomalies - we group the “segments" of the two anomalies into one graph. In the example below, the first anomaly is a drop, and when the trend line crosses the baseline and changes direction, it becomes a spike. Note that in some cases, the baseline might be very thin, so it could be harder to discern it from the trend line.