I’ve “built” a quick and dirty page just to host the widget for my sensor:
https://asl.hapahaus.com/weatherwong-widget.html
as can be seen in the widget string (view source on linked page), the displayed value should have the ALT cf=3 conversion factor applied. however, only the unconverted value shows. this exact same widget correctly shows the conversion factor when you bring it up on the purpleair map.
i have tried it with other conversion factors as well, but the widget will always only show the unconverted value.
Looking at the widget code, the ‘ALT cf=3’ conversion is not implemented, so it will default to No conversion. There are implementations only for None, AQandU, LRAPA, US EPA, and WOODSMOKE.
The widget and map are different code. I suspect the widget is an earlier version of the map code with some adaptations, but hasn’t been kept up to date with map additions.