WD not picking up calm Metar Winds

Im have a Davis WL II system that I am using with WD. My exposure for wind is not good so I am using the Metar winds instead of the anemometer on my WL II. My problem is that WD does not appear to recognize calm winds when the Metar reports them. Instead, WD reports the last non-calm wind direction and speed whenever the Metar reports calm. The Metar I am using is KAIZ.

Im new to WD so perhaps I have not configured things properly. I’ve been trying to work around this problem for about a month and havent had any luck, so Im starting to think it might be a bug in the program perhaps?