WEATHER UNDERGROUND API

I am running Aercus 1001 , windows 10 and latest wd dowonload,weatherground api.
Readdings on weather underground site correct,but when using api the day before rain total shows up as rain,ie (yesterdays rain total was 1.8mm at 0915hrs today it shows 1.8mm rain when no rain,
wd set for midnight reset.
weatherunderground shows the same as station console

Regards

Peter

is WD running all the time?

Yes,i did have a power cut 2 days ago during the day