You've likely used a negative longitude in the WD setup. WD uses astronomical longitude, so negative numbers are EAST of GMT, while positive numbers are WEST of GMT. The opposite is the case for terrestrial longitude such as used in map programs.
Open Weather-Display, Control Panel, Solar Sensor, Max Solar Time of Day/Time Zone Lat/Long. Fudge offset TAB
Change the Longitude number to positive, and press OK to save.
That should fix the issue.