There is a lot of stuff on the forums about anomaly likelihood and anomaly scores. Try out a few searches and see if you find anything useful before starting a new post. See the Before Posting section of the Read this first post.
You should fine that the anomaly likelihood score is generally more reliable and less fluctuating than the raw anomaly score. You can also find out how it is generated, and what thresholds you might use to indicate anomalies (0.9999 is typical, but you might want more or less 9s).