GPS seems to be the issue. With location enabled in iOS Settings (which I never had to enable before) it opened to the correct location. Disabling location in Settings resulted in the erroneous pan to 0/0.
It looks like the latest update to the app expects location services to be enabled. But, I don’t want my weather app following me around so I have it disabled.
If anyone else wants to try replicating the above I can write step-by-step instructions.
The TLDR method is to disable location in iOS Settings for the Windy app, then click on the widget. It should open and pan to 0.00, 0.00 rather than your preferred startup favorite. This assumes your startup location is a favorite and not IP or GPS.