Smart weather station showing negative illuminance

The Smart Weather Station Controller App from rboy has started showing illuminance levels as negative even when there is plenty of light around sunset time. I have the latest version of the app 02.01.02. Is negative illuminance normal? I have recently started using automation based on illuminance, so I don’t know much about it.

The SmartWeather Station “tile” (DTH) shows the illuminance (and that’s from SmartThings). The controller SmartApp sits on top of the tile to add more features like notifications, filters, update frequency etc.

From what I can see in the DTH code the lux should never be negative, maybe @dkirker can comment. If you have a screenshot it may help.

Here is the screenshot…