Let me try a self-reply to see if it makes sense to anyone else.
It looks like my temperature and dewpoint are the part that is stuck. Looking down at my density altitude graph on
http://stu-in-flag.net, it appears to be changing, but not as much as it should or has. I bet if I look at the uncorrected pressure, it's changing. But, since the WMr200 uses temperature to correct the barometric pressure, it is getting stuck as well.
Thoughts?