negative cloud cover at the weather picker

[noalt]

I suppose this is a bug, or does it have some hidden meaning?
(negative cloud cover at the weather picker.

detailLocation
{ "lat": "51.093", "lon": "3.703", "source": "url", "display": "table", "name": "Ghent", "emitter": "externalOpen", "timestamps": null, "model": "iconEu", "rows": [ "hour", "icon", "temp", "rain", "wind", "gust", "windDir" ], "tdWidth": 30, "iconSize": 25, "days": 6, "tempBgH": 93, "step": 3, "height": 154, "zoom": 7 }

detailProduct
"iconEu"

color2_clouds
permanent, syncedWithCloud [ [ 0, [ 146, 130, 70, 255 ] ], [ 10, [ 132, 119, 70, 255 ] ], [ 30, [ 116, 116, 116, 255 ] ], [ 80, [ 173, 183, 182, 255 ] ], [ 95, [ 190, 193, 193, 255 ] ], [ 100, [ 213, 213, 205, 255 ] ] ]

Regards,